Random Reboots. Error Codes: 1000008e, 1000000a, 0000004e

Hello all. For about the past 4 days, my computer has been randomly rebooting by itself. I am running WindowsXP SP3. I did a system restore to roll back my system to a date when everything was running fine. Unfortunately, this did not solve the problem.

Here are the relevant messages from Event viewer from the first system error event to the most recent (4 in total so far):

1)
Event Type: Error
Event Source: System Error
Event Category: (102)
Event ID: 1003
Date: 11/26/2009
Time: 3:26:24 PM
User: N/A
Computer: COMPUTER
Description:
Error code 0000004e, parameter1 00000099, parameter2 000fffff, parameter3 00000007, parameter4 00000000

2)
Event Type: Error
Event Source: System Error
Event Category: (102)
Event ID: 1003
Date: 11/28/2009
Time: 12:14:02 AM
User: N/A
Computer: COMPUTER
Description:
Error code 1000000a, parameter1 003c0070, parameter2 00000002, parameter3 00000001, parameter4 804ea16f

3)
Event Type: Error
Event Source: System Error
Event Category: (102)
Event ID: 1003
Date: 11/29/2009
Time: 2:48:48 AM
User: N/A
Computer: COMPUTER
Description:
Error code 1000008e, parameter1 c0000005, parameter2 bd1f132a, parameter3 b25d287c, parameter4 00000000

4)
Event Type: Error
Event Source: System Error
Event Category: (102)
Event ID: 1003
Date: 11/29/2009
Time: 7:25:03 AM
User: N/A
Computer: COMPUTER
Description:
Error code 1000008e, parameter1 c0000005, parameter2 bd1f132a, parameter3 b518f87c, parameter4 00000000

I have also uploaded the most recent minidumps as a zip.

Thank you for any help you can offer. Much appreciated!

To stop it rebooting, go to Control Panel>System, then click "Advanced System settings" in the left-hand pane. In the System Properties dialog, click Settings under "Startup and Recovery", and then uncheck "Automatically restart". After that it will give a Blue Screen error which is easier to troubleshoot.

Then download UBCD and burn it to CD, it has all the memory testing and disk diagnostic utilities on it plus many more besides. Run MemTest and Windows Memory Diagnostic, as well as the disk utility for your brand of hard drive (or Seatools if you aren't sure). All you have to do is to boot up with the disc in the drive, select the utility that you want to use, and it will run.

Ultimate Boot CD