Here is another funny story:
The link you provided for Sophos is dead, so I downloaded it from here:
https://www.techspot.com/downloads/5448-sophos-virus-removal-tool.html
Followed your steps and it started scanning. It went for a bit, then the PC rebooted to this screen:
Is this what it does?
This thing finished its job and Windows loaded.
I searched for a log file and I found this:
2018-04-28 08:43:31.472 Sophos Virus Removal Tool version 2.6.1
2018-04-28 08:43:31.480 Copyright (c) 2009-2017 Sophos Limited. All rights reserved.
2018-04-28 08:43:31.480 This tool will scan your computer for viruses and other threats. If it finds any, it will give you the option to remove them.
2018-04-28 08:43:31.480 Windows version 6.1 SP 1.0 Service Pack 1 build 7601 SM=0x100 PT=0x1 Win32
2018-04-28 08:43:31.496 Checking for updates...
2018-04-28 08:43:32.262 Update progress: proxy server not available
2018-04-28 08:43:58.592 Option all = no
2018-04-28 08:43:58.592 Option recurse = yes
2018-04-28 08:43:58.592 Option archive = no
2018-04-28 08:43:58.592 Option service = yes
2018-04-28 08:43:58.592 Option confirm = yes
2018-04-28 08:43:58.592 Option sxl = yes
2018-04-28 08:43:58.592 Option max-data-age = 35
2018-04-28 08:43:58.592 Option vdl-logging = yes
2018-04-28 08:43:58.732 Customer ID: 094260ca9b3af99f9d4a3909fc47a743
2018-04-28 08:43:58.732 Machine ID: 0cbb1ee757204b6c9370954393fae150
2018-04-28 08:43:58.765 Component SVRTcli.exe version 2.6.1
2018-04-28 08:43:58.766 Component control.dll version 2.6.1
2018-04-28 08:43:58.766 Component SVRTservice.exe version 2.6.1
2018-04-28 08:43:58.767 Component engine\osdp.dll version 1.44.1.2286
2018-04-28 08:43:58.767 Component engine\veex.dll version 3.68.6.2286
2018-04-28 08:43:58.768 Component engine\savi.dll version 9.0.7.2286
2018-04-28 08:43:58.769 Component rkdisk.dll version 1.5.31.1
2018-04-28 08:43:58.769 Version info: Product version 2.6.1
2018-04-28 08:43:58.771 Version info: Detection engine 3.68.6
2018-04-28 08:43:58.771 Version info: Detection data 5.46
2018-04-28 08:43:58.772 Version info: Build date 11/28/2017
2018-04-28 08:43:58.772 Version info: Data files added 746
2018-04-28 08:43:58.772 Version info: Last successful update (not yet updated)
2018-04-28 08:44:02.667 Downloading updates...
2018-04-28 08:44:02.670 Update progress: [I96736] sdds.svrt_10: adding primary package C1A903B2-E63E-483b-982D-04BB9C457C60 RECOMMENDED baseVersion=1
2018-04-28 08:44:02.670 Update progress: [I95020] sdds.svrt_10: looking for packages included from product C1A903B2-E63E-483b-982D-04BB9C457C60 RECOMMENDED path=
2018-04-28 08:44:02.670 Update progress: [I22529] sdds.svrt_10: looking for supplements included from product C1A903B2-E63E-483b-982D-04BB9C457C60 RECOMMENDED path=
2018-04-28 08:44:02.670 Update progress: [I49502] sdds.savi0910.xml: found supplement SAVIW32 LATEST path= baseVersion= [included from product C1A903B2-E63E-483b-982D-04BB9C457C60 RECOMMENDED path=]
2018-04-28 08:44:02.670 Update progress: [I95020] sdds.savi0910.xml: looking for packages included from product SAVIW32 LATEST path=
2018-04-28 08:44:02.670 Update progress: [I22529] sdds.savi0910.xml: looking for supplements included from product SAVIW32 LATEST path=
2018-04-28 08:44:02.670 Update progress: [I49502] sdds.data0910.xml: found supplement IDE547 LATEST path= baseVersion= [included from product SAVIW32 LATEST path=]
2018-04-28 08:44:02.670 Update progress: [I95020] sdds.data0910.xml: looking for packages included from product IDE547 LATEST path=
2018-04-28 08:44:02.670 Update progress: [I22529] sdds.data0910.xml: looking for supplements included from product IDE547 LATEST path=
2018-04-28 08:44:02.670 Update progress: [I49502] sdds.data0910.xml: found supplement IDE548 LATEST path= baseVersion= [included from product IDE547 LATEST path=]
2018-04-28 08:44:02.670 Update progress: [I95020] sdds.data0910.xml: looking for packages included from product IDE548 LATEST path=
2018-04-28 08:44:02.670 Update progress: [I22529] sdds.data0910.xml: looking for supplements included from product IDE548 LATEST path=
2018-04-28 08:44:02.670 Update progress: [I49502] sdds.data0910.xml: found supplement IDE549 LATEST path= baseVersion= [included from product IDE548 LATEST path=]
2018-04-28 08:44:02.670 Update progress: [I95020] sdds.data0910.xml: looking for packages included from product IDE549 LATEST path=
2018-04-28 08:44:02.670 Update progress: [I22529] sdds.data0910.xml: looking for supplements included from product IDE549 LATEST path=
2018-04-28 08:44:02.671 Update progress: [I49502] sdds.data0910.xml: found supplement IDE550 LATEST path= baseVersion= [included from product IDE549 LATEST path=]
2018-04-28 08:44:02.671 Update progress: [I95020] sdds.data0910.xml: looking for packages included from product IDE550 LATEST path=
2018-04-28 08:44:02.671 Update progress: [I22529] sdds.data0910.xml: looking for supplements included from product IDE550 LATEST path=
2018-04-28 08:44:02.671 Update progress: [I49502] sdds.data0910.xml: found supplement IDE551 LATEST path= baseVersion= [included from product IDE550 LATEST path=]
2018-04-28 08:44:02.671 Update progress: [I95020] sdds.data0910.xml: looking for packages included from product IDE551 LATEST path=
2018-04-28 08:44:02.671 Update progress: [I22529] sdds.data0910.xml: looking for supplements included from product IDE551 LATEST path=
2018-04-28 08:44:02.671 Update progress: [I49502] sdds.data0910.xml: found supplement IDE552 LATEST path= baseVersion= [included from product IDE551 LATEST path=]
2018-04-28 08:44:02.671 Update progress: [I95020] sdds.data0910.xml: looking for packages included from product IDE552 LATEST path=
2018-04-28 08:44:02.671 Update progress: [I22529] sdds.data0910.xml: looking for supplements included from product IDE552 LATEST path=
2018-04-28 08:44:02.671 Update progress: [I49502] sdds.data0910.xml: found supplement IDE553 LATEST path= baseVersion= [included from product IDE552 LATEST path=]
2018-04-28 08:44:02.671 Update progress: [I95020] sdds.data0910.xml: looking for packages included from product IDE553 LATEST path=
2018-04-28 08:44:02.671 Update progress: [I22529] sdds.data0910.xml: looking for supplements included from product IDE553 LATEST path=
2018-04-28 08:44:02.671 Update progress: [I19463] Syncing product C1A903B2-E63E-483b-982D-04BB9C457C60 RECOMMENDED path=
2018-04-28 08:44:03.636 Update progress: [I19463] Syncing product SAVIW32 LATEST path=
2018-04-28 08:44:03.636 Update progress: [I19463] Product download size 178991033 bytes
2018-04-28 08:44:25.269 Update progress: [I19463] Syncing product IDE547 LATEST path=
2018-04-28 08:44:25.269 Update progress: [I19463] Product download size 4521286 bytes
2018-04-28 08:44:27.908 Update progress: [I19463] Syncing product IDE548 LATEST path=
2018-04-28 08:44:27.908 Update progress: [I19463] Product download size 3541768 bytes
2018-04-28 08:44:30.517 Update progress: [I19463] Syncing product IDE549 LATEST path=
2018-04-28 08:44:30.518 Update progress: [I19463] Product download size 4830037 bytes
2018-04-28 08:44:33.625 Update progress: [I19463] Syncing product IDE550 LATEST path=
2018-04-28 08:44:33.625 Update progress: [I19463] Product download size 2760469 bytes
2018-04-28 08:44:35.111 Update progress: [I19463] Syncing product IDE551 LATEST path=
2018-04-28 08:44:35.111 Update progress: [I19463] Product download size 2676611 bytes
2018-04-28 08:44:40.439 Update progress: [I19463] Syncing product IDE552 LATEST path=
2018-04-28 08:44:40.439 Update progress: [I19463] Product download size 799556 bytes
2018-04-28 08:44:43.809 Update progress: [I19463] Syncing product IDE553 LATEST path=
2018-04-28 08:44:43.931 Installing updates...
2018-04-28 08:44:45.581 Error level 1
2018-04-28 08:45:12.921 Update successful
2018-04-28 08:45:37.791 Option all = no
2018-04-28 08:45:37.791 Option recurse = yes
2018-04-28 08:45:37.791 Option archive = no
2018-04-28 08:45:37.791 Option service = yes
2018-04-28 08:45:37.791 Option confirm = yes
2018-04-28 08:45:37.791 Option sxl = yes
2018-04-28 08:45:37.801 Option max-data-age = 35
2018-04-28 08:45:37.801 Option vdl-logging = yes
2018-04-28 08:45:37.809 Customer ID: 094260ca9b3af99f9d4a3909fc47a743
2018-04-28 08:45:37.809 Machine ID: 0cbb1ee757204b6c9370954393fae150
2018-04-28 08:45:37.825 Component SVRTcli.exe version 2.6.1
2018-04-28 08:45:37.825 Component control.dll version 2.6.1
2018-04-28 08:45:37.825 Component SVRTservice.exe version 2.6.1
2018-04-28 08:45:37.825 Component engine\osdp.dll version 1.44.1.2286
2018-04-28 08:45:37.825 Component engine\veex.dll version 3.68.6.2286
2018-04-28 08:45:37.825 Component engine\savi.dll version 9.0.7.2286
2018-04-28 08:45:37.825 Component rkdisk.dll version 1.5.31.1
2018-04-28 08:45:37.825 Version info: Product version 2.6.1
2018-04-28 08:45:37.833 Version info: Detection engine 3.68.6
2018-04-28 08:45:37.833 Version info: Detection data 5.46
2018-04-28 08:45:37.833 Version info: Build date 11/28/2017
2018-04-28 08:45:37.833 Version info: Data files added 844
2018-04-28 08:45:37.833 Version info: Last successful update 4/28/2018 11:45:12 AM
2018-04-28 08:45:51.841 Couldn't apply option 'SXLLiveProtection' to the detection engine.
2018-04-28 08:58:31.108 Sophos Virus Removal Tool version 2.6.1
2018-04-28 08:58:31.108 Copyright (c) 2009-2017 Sophos Limited. All rights reserved.
2018-04-28 08:58:31.108 This tool will scan your computer for viruses and other threats. If it finds any, it will give you the option to remove them.
2018-04-28 08:58:31.108 Windows version 6.1 SP 1.0 Service Pack 1 build 7601 SM=0x100 PT=0x1 Win32
2018-04-28 08:58:31.186 Checking for updates...
2018-04-28 08:58:31.624 Error: failed to create service (1072: The specified service has been marked for deletion.)
2018-04-28 08:58:31.874 Update progress: proxy server not available
2018-04-28 09:00:18.183 Sophos Virus Removal Tool version 2.6.1
2018-04-28 09:00:18.183 Copyright (c) 2009-2017 Sophos Limited. All rights reserved.
2018-04-28 09:00:18.183 This tool will scan your computer for viruses and other threats. If it finds any, it will give you the option to remove them.
2018-04-28 09:00:18.183 Windows version 6.1 SP 1.0 Service Pack 1 build 7601 SM=0x100 PT=0x1 Win32
2018-04-28 09:00:18.183 Checking for updates...
2018-04-28 09:00:20.714 Update progress: proxy server not available
2018-04-28 09:00:24.511 Warning: failed to start SMS service (1056: An instance of the service is already running.)
2018-04-28 09:00:58.230 Downloading updates...
2018-04-28 09:00:58.230 Update progress: [I96736] sdds.svrt_10: adding primary package C1A903B2-E63E-483b-982D-04BB9C457C60 RECOMMENDED baseVersion=1
2018-04-28 09:00:58.230 Update progress: [I95020] sdds.svrt_10: looking for packages included from product C1A903B2-E63E-483b-982D-04BB9C457C60 RECOMMENDED path=
2018-04-28 09:00:58.230 Update progress: [I22529] sdds.svrt_10: looking for supplements included from product C1A903B2-E63E-483b-982D-04BB9C457C60 RECOMMENDED path=
2018-04-28 09:00:58.230 Update progress: [I49502] sdds.savi0910.xml: found supplement SAVIW32 LATEST path= baseVersion= [included from product C1A903B2-E63E-483b-982D-04BB9C457C60 RECOMMENDED path=]
2018-04-28 09:00:58.230 Update progress: [I95020] sdds.savi0910.xml: looking for packages included from product SAVIW32 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I22529] sdds.savi0910.xml: looking for supplements included from product SAVIW32 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I49502] sdds.data0910.xml: found supplement IDE547 LATEST path= baseVersion= [included from product SAVIW32 LATEST path=]
2018-04-28 09:00:58.230 Update progress: [I95020] sdds.data0910.xml: looking for packages included from product IDE547 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I22529] sdds.data0910.xml: looking for supplements included from product IDE547 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I49502] sdds.data0910.xml: found supplement IDE548 LATEST path= baseVersion= [included from product IDE547 LATEST path=]
2018-04-28 09:00:58.230 Update progress: [I95020] sdds.data0910.xml: looking for packages included from product IDE548 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I22529] sdds.data0910.xml: looking for supplements included from product IDE548 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I49502] sdds.data0910.xml: found supplement IDE549 LATEST path= baseVersion= [included from product IDE548 LATEST path=]
2018-04-28 09:00:58.230 Update progress: [I95020] sdds.data0910.xml: looking for packages included from product IDE549 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I22529] sdds.data0910.xml: looking for supplements included from product IDE549 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I49502] sdds.data0910.xml: found supplement IDE550 LATEST path= baseVersion= [included from product IDE549 LATEST path=]
2018-04-28 09:00:58.230 Update progress: [I95020] sdds.data0910.xml: looking for packages included from product IDE550 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I22529] sdds.data0910.xml: looking for supplements included from product IDE550 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I49502] sdds.data0910.xml: found supplement IDE551 LATEST path= baseVersion= [included from product IDE550 LATEST path=]
2018-04-28 09:00:58.230 Update progress: [I95020] sdds.data0910.xml: looking for packages included from product IDE551 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I22529] sdds.data0910.xml: looking for supplements included from product IDE551 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I49502] sdds.data0910.xml: found supplement IDE552 LATEST path= baseVersion= [included from product IDE551 LATEST path=]
2018-04-28 09:00:58.230 Update progress: [I95020] sdds.data0910.xml: looking for packages included from product IDE552 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I22529] sdds.data0910.xml: looking for supplements included from product IDE552 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I49502] sdds.data0910.xml: found supplement IDE553 LATEST path= baseVersion= [included from product IDE552 LATEST path=]
2018-04-28 09:00:58.230 Update progress: [I95020] sdds.data0910.xml: looking for packages included from product IDE553 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I22529] sdds.data0910.xml: looking for supplements included from product IDE553 LATEST path=
2018-04-28 09:00:58.230 Update progress: [I19463] Syncing product C1A903B2-E63E-483b-982D-04BB9C457C60 RECOMMENDED path=
2018-04-28 09:00:58.464 Update progress: [I19463] Syncing product SAVIW32 LATEST path=
2018-04-28 09:00:58.589 Update progress: [I19463] Syncing product IDE547 LATEST path=
2018-04-28 09:00:58.699 Update progress: [I19463] Syncing product IDE548 LATEST path=
2018-04-28 09:00:58.808 Update progress: [I19463] Syncing product IDE549 LATEST path=
2018-04-28 09:00:58.902 Update progress: [I19463] Syncing product IDE550 LATEST path=
2018-04-28 09:00:59.027 Update progress: [I19463] Syncing product IDE551 LATEST path=
2018-04-28 09:00:59.058 Update progress: [I19463] Syncing product IDE552 LATEST path=
2018-04-28 09:00:59.074 Update progress: [I19463] Syncing product IDE553 LATEST path=
2018-04-28 09:00:59.246 Installing updates...
2018-04-28 09:01:05.621 Option all = no
2018-04-28 09:01:06.886 Option recurse = yes
2018-04-28 09:01:06.886 Option archive = no
2018-04-28 09:01:06.886 Option service = yes
2018-04-28 09:01:06.886 Option confirm = yes
2018-04-28 09:01:06.886 Option sxl = yes
2018-04-28 09:01:06.886 Option max-data-age = 35
2018-04-28 09:01:06.886 Option vdl-logging = yes
2018-04-28 09:01:06.886 Customer ID: 094260ca9b3af99f9d4a3909fc47a743
2018-04-28 09:01:06.886 Machine ID: 0cbb1ee757204b6c9370954393fae150
2018-04-28 09:01:06.886 Component SVRTcli.exe version 2.6.1
2018-04-28 09:01:06.886 Component control.dll version 2.6.1
2018-04-28 09:01:06.886 Component SVRTservice.exe version 2.6.1
2018-04-28 09:01:06.886 Component engine\osdp.dll version 1.44.1.2286
2018-04-28 09:01:06.886 Component engine\veex.dll version 3.68.6.2286
2018-04-28 09:01:06.886 Component engine\savi.dll version 9.0.7.2286
2018-04-28 09:01:06.886 Component rkdisk.dll version 1.5.31.1
2018-04-28 09:01:06.886 Version info: Product version 2.6.1
2018-04-28 09:01:06.886 Version info: Detection engine 3.68.6
2018-04-28 09:01:06.886 Version info: Detection data 5.46
2018-04-28 09:01:06.886 Version info: Build date 11/28/2017
2018-04-28 09:01:06.886 Version info: Data files added 844
2018-04-28 09:01:06.886 Version info: Last successful update 4/28/2018 11:45:12 AM
2018-04-28 09:01:06.886 Error level 1
2018-04-28 09:01:09.417 Update successful
2018-04-28 09:01:31.152 Option all = no
2018-04-28 09:01:31.152 Option recurse = yes
2018-04-28 09:01:31.152 Option archive = no
2018-04-28 09:01:31.152 Option service = yes
2018-04-28 09:01:31.152 Option confirm = yes
2018-04-28 09:01:31.152 Option sxl = yes
2018-04-28 09:01:31.152 Option max-data-age = 35
2018-04-28 09:01:31.152 Option vdl-logging = yes
2018-04-28 09:01:31.152 Customer ID: 094260ca9b3af99f9d4a3909fc47a743
2018-04-28 09:01:31.152 Machine ID: 0cbb1ee757204b6c9370954393fae150
2018-04-28 09:01:31.167 Component SVRTcli.exe version 2.6.1
2018-04-28 09:01:31.167 Component control.dll version 2.6.1
2018-04-28 09:01:31.167 Component SVRTservice.exe version 2.6.1
2018-04-28 09:01:31.167 Component engine\osdp.dll version 1.44.1.2286
2018-04-28 09:01:31.167 Component engine\veex.dll version 3.68.6.2286
2018-04-28 09:01:31.167 Component engine\savi.dll version 9.0.7.2286
2018-04-28 09:01:31.183 Component rkdisk.dll version 1.5.31.1
2018-04-28 09:01:31.183 Version info: Product version 2.6.1
2018-04-28 09:01:31.183 Version info: Detection engine 3.68.6
2018-04-28 09:01:31.183 Version info: Detection data 5.46
2018-04-28 09:01:31.183 Version info: Build date 11/28/2017
2018-04-28 09:01:31.183 Version info: Data files added 844
2018-04-28 09:01:31.183 Version info: Last successful update 4/28/2018 12:01:09 PM
2018-04-28 09:01:34.511 Couldn't apply option 'SXLLiveProtection' to the detection engine.