This article explains how to start a Windows XP computer in Safe Mode. This can help you diagnose and fix many serious problems, especially when normal startup is not possible.
How to Boot Windows XP in Safe Mode [Tutorial]
To get started, turn on or restart your PC.
Just before the Windows XP Welcome screen (pictured above) appears, press the F8 key to open the Windows Advanced Options menu.
You will be given three variations of Safe Mode that you can enter. Use the arrow keys on your keyboard to highlight one of these options and then press Enter: