How to Repair Windows XP
How to access Safe Mode:
Reboot your computer while holding down the F8 Key. At the Advanced Options Menu select the option for Safe Mode and press Enter.
How to access Last Known Good Configuration:
Reboot your computer while holding down the F8 Key. At the Advanced Options Menu select Last Known Good Configuration.
Hopefully you've set a restore point rather than let the computer do it for you. Download the program System Restore Point posted earlier in this blog.
http://www.webtree.ca/windowsxp/repair_xp.htm#How%20to%20access%20Safe%20Mode: