You may be able to get more info from the Event viewer .
HOW TO: View and Manage Event Logs in Event Viewer in Windows XP
http://support.microsoft.com/default...b;EN-US;308427
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Windows XP Events and Errors
Enter the message source and ID in the text field, then click G
http://www.microsoft.com/windowsxp/pro/support/ee
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If you want to stop the blue screen auto reboot so you can read the error message from the screen:
Go to Start -> Control Panel -> System
Go to Advanced
Under the Startup and Recovery section, click Settings...
Under System Failure un-check "Automatically restart"