This won't fix your problem, but it'll keep your machine from rebooting.
Unless the rebooting is caused by a hardware problem.
It may also help reading a BSOD. Blue Screen Of Death.
Choosing recovery actions if Windows stops unexpectedly
Right click My Computer | Properties | Advanced tab |
Click the Settings button under Startup and Recovery |
Under System Failure | UNCheck: Automatically restart |
Click OK | Click Apply | Click OK
Automatically restart
[[Specifies whether Windows will automatically reboot whenever the system
stops unexpectedly.
You must be logged on as a member of the Administrators group to set
recovery options.]]
The following certainly can't hurt.
UPDATE your antivirus software and run a full system scan.
UPDATE whatever anti-spyware applications that you have and run a full
system scan with each one.
You might want to start in Safe Mode to run your antivirus and anti-spyware
software.
Running a full system antivirus scan or anti-spyware scan in Safe Mode can
be a good idea. Some viruses and other malware like to conceal themselves
in areas Windows protects while using them. Safe mode will prevent those
applications access and therefore unprotect the viruses or other malware
allowing for easier removal.
How to start Windows in Safe Mode Windows XP
http://www.bleepingcomputer.com/forums/index.php?showtutorial=61#winxo
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Hope this helps. Let us know.
Wes
MS-MVP Windows Shell/User
In