Computer random? Reboots

Hi I've been recommended to post here for help. The PC seems to have random reboots. This is the last errors from event viewer

Event Type: Error
Event Source: System Error
Event Category: (102)
Event ID: 1003
Date: 19/06/2006
Time: 22:17:50
User: N/A
Computer: NEWPCUPSTAIRS
Description:
Error code 00000019, parameter1 00000020, parameter2 84f0f250, parameter3 84f0f398, parameter4 0a290001.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 53 79 73 74 65 6d 20 45 System E
0008: 72 72 6f 72 20 20 45 72 rror Er
0010: 72 6f 72 20 63 6f 64 65 ror code
0018: 20 30 30 30 30 30 30 31 0000001
0020: 39 20 20 50 61 72 61 6d 9 Param
0028: 65 74 65 72 73 20 30 30 eters 00
0030: 30 30 30 30 32 30 2c 20 000020,
0038: 38 34 66 30 66 32 35 30 84f0f250
0040: 2c 20 38 34 66 30 66 33 , 84f0f3
0048: 39 38 2c 20 30 61 32 39 98, 0a29
0050: 30 30 30 31 0001


AND

Event Type: Error
Event Source: System Error
Event Category: (102)
Event ID: 1003
Date: 19/06/2006
Time: 22:17:22
User: N/A
Computer: NEWPCUPSTAIRS
Description:
Error code 00000019, parameter1 00000020, parameter2 851f3d98, parameter3 851f3ee0, parameter4 0a290001.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 53 79 73 74 65 6d 20 45 System E
0008: 72 72 6f 72 20 20 45 72 rror Er
0010: 72 6f 72 20 63 6f 64 65 ror code
0018: 20 30 30 30 30 30 30 31 0000001
0020: 39 20 20 50 61 72 61 6d 9 Param
0028: 65 74 65 72 73 20 30 30 eters 00
0030: 30 30 30 30 32 30 2c 20 000020,
0038: 38 35 31 66 33 64 39 38 851f3d98
0040: 2c 20 38 35 31 66 33 65 , 851f3e
0048: 65 30 2c 20 30 61 32 39 e0, 0a29
0050: 30 30 30 31 0001

It may be faulty or misconfigured RAM. Is it a new build?

No, it's been up and running fine for 8 months or so and got de-fluffed a few weeks ago. A couple of days ago the PC came on with a Blue screen doing a checkdisk. It then started with the rebooting, when I looked in the event viewer there was a lot of warnings that a system startup driver "xprotector" had failed to load. I'd not downloaded this, couldn't see what used it so I deleted from device manager thinking that whatever used it would stop working, however it still does random reboots and everything appears to work. Usually in a game, any game. When I searched for xprotector in the registery there was a lot of references in folders headed Legacy.

Here are my minidumps for your consideration.

Thanks inadvance

Getting this now as well

Event Type: Error
Event Source: sr
Event Category: None
Event ID: 1
Date: 20/06/2006
Time: 16:32:16
User: N/A
Computer: NEWPCUPSTAIRS
Description:
The System Restore filter encountered the unexpected error '0xC0000043' while processing the file 'SAVRT' on the volume 'HarddiskVolume1'. It has stopped monitoring the volume.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
0000: 15 00 00 00 04 00 4e 00 ......N.
0008: 00 00 00 00 01 00 00 c0 .......À
0010: 00 00 00 00 00 00 00 00 ........
0018: 00 00 00 00 00 00 00 00 ........
0020: 00 00 00 00 00 00 00 00 ........