You can search on the system for C:\WINDOWS\system32\grpconv.exe
Right click on Taskbar> Explore> My Computer> Double click Local Drive(C)> Windows> System 32> Look for grpconv.exe on right screen> right click Delete.

If you don't see the file> once in Windows Explorer>

• Go to Tools > Folder Options.
• Select the View tab.
• Scroll down to Hidden files and folders.
• Select Show hidden files and folders.
• Uncheck (untick) Hide extensions of known file types.
• Uncheck (untick) Hide protected operating system files (Recommended).
• Click Yes when prompted.
• Click OK.
• Pick up the directions above beginning with 'Windows'.

Reset Hidden/System Files & Folders
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Both Spysweeper and Malwarebytes are okay to keep on system, but Mbam will require you to purchase the program to keep it on the system.
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Tips for added security and safer browsing: (Links are in Bold Blue)

1. Browser Security
   [o] Safe Settings
   [o] ZonedOut. This manages the Zones in Internet Explorer. (For IE7 and IE8, Windows 2000 thru Vista. No Windows 7)
   [o] Replace the Host Files
   [o] Google Toolbar Pop Up Blocker
   [o]Web of Trust (WOT) Site Advisor. Traffic-light rating symbols show which rate the site for Trustworthiness, Vendor Reliability, Privacy, Child Safety.
   
2. Have layered Security:
   [o]Antivirus :(only one):Both of the following programs are free and known to be good:
   [o]Avira-AntiVir-Personal-Free-Antivirus
   [o]Avast Free Version
   [o]Firewall (only one): Use bi-directional firewall. Both of the following programs are free and known to be good:
   [o]Comodo
   [o]Zone Alarm
   
3. Antimalware: I recommend all of the following:
   [o]Spywareblaster: SpywareBlaster protects against bad ActiveX.
   [o]Spybot Search & Destroy
   
4. Updates: Stay current:
   [o] the Microsoft Download Sitefrequently. All updates marked Critical and the current SP updates.
   [o]Adobe Reader Install current, uninstall old.
   [o]Java Updates Install current, uninstall old.
   
5. Tracking Cookies
   Reset Cookie:
   [o]For Internet Explorer: Internet Options (through Tools or Control Panel) Privacy tab> Advanced button> check 'override automatic Cookie handling'> check 'accept first party Cookies'> check 'Block third party Cookies'> check 'allow per session Cookies'> Apply> OK.
   [o]For Firefox: Tools> Options> Privacy> Cookies> check ‘accept Cookies from Sites’> Uncheck 'accept third party Cookies'> Set Keep until 'they expire'. This will allow you to keep Cookies for registered sites and prevent or remove others. (Note: for Firefox v3.5, after Privacy click on 'use custom settings for History.')
   I suggest using the following two add-on for Firefox. They will prevent the Tracking Cookies that come from ads and banners and other sources:
   AdBlock Plus
   Easy List
   [o]For Chrome: Tools> Options> Under The Hood> Privacy Section> CHECK 'Restrict how third party Cookies can be used'> Close.
   
6. Do regular Maintenance
   [o] Temporary File Cleaner
7. Restore Points:
   [o]See System Restore Guide
8. Safe Email Handling
   [o] Don't open email from anyone you don't know.
   [o] Don't open Attachments in the email. Safe to your desktop and scan for viruses using a right click
   [o] Don't leave your personal email address on the internet. Have a separate email account at one of the free web-based emails like Yahoo.

Please let me know if you find any bad link.

How do you mean 'master file'?

My internet was down- again.

Just do a right click on the .exe file.

Then you are through.

Okay, you clean and finished.