Errors generated by software programs or hardware faults can cause your computer to reboot unexpectedly or without warning.
Windows XP has been designed to automatically reboot each time an error occurs such as a Blue screen of death.
The problem is that users who have a re-occurring error may wish to identify the error to troubleshoot it. Below are the steps on how this feature can be disabled in Windows XP.
1. From the desktop right click on My Computer.
2. Click the Properties option.
3. In the System Properties window click the Advanced tab.
4. In Advanced click the Settings button under Startup and Recovery.
5. In the Startup and Recovery window uncheck the Automatically restart check box.
6. Click Ok.
Now if the computer generates and error it should not automatically restart and enable you to display any errors your computer may be experiencing.