you need to be able to read an error message. XP automatically restarts when its in trouble. To turn this silly feature off, Right-click on My Computer and select the Properties command from the shortcut menu.
When you see the System Properties dialogue box, select the Advanced tab. Then, select the Settings button in the Startup And Recovery panel.
Once the Startup And Recovery dialogue box appears, clear the Automatically Restart check box in the System Failure panel and click OK.
When it restarts again you will, this time get an error message, in other words half way home.