Please furnish more information on this problem. Automatic restarts are usually caused by fatal errors (or hardware issues). Meanwhile, this general info might help:
System restarts automatically because of a STOP error and if XP is configured to "Automatically Restart" on errors. In this case, exact error is unknown. So, you want to uncheck the "Automatically Restart" option and next time, system won't reboot again. Instead it shows the STOP blue screen. There you can identify which driver is causing the error.
Click Start, click Control Panel, click Performance and Maintenance, and then click System.
Click the Advanced tab.
Under Startup and Recovery, click Settings.
Under System Failure, select the check boxes that correspond to the actions that you want Windows to perform if a sever error occurs.
Uncheck "Automatically restart"
You receive a "Stop: c0000135" and "winsrv was not found" error message after you install Windows XP Service Pack 2: http://support.microsoft.com/kb/885523
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If you encountered this Stop c0000135 error message after you installed Windows XP SP2, see the “More Information” section for instructions on how to recover your system. Follow the guidelines in this section to prevent this problem from repeating.
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