Try starting the computer in Safe Mode, then use System Restore to a point before the problems began:
Start or restart the computer.
As soon as the BIOS has finished loading, begin tapping the F8 key on your keyboard; continue to do so until the Windows Advanced Options menu appears (if you begin tapping the F8 key too soon, some computers display a "keyboard error" message, if you get this message, restart the computer and try again).
Using the arrow keys on the keyboard, scroll to and select the Safe Mode menu item, and then press Enter.
To use System Restore, right click My Computer, go to Properties, go to System Restore, and then to the Restore tab (I believe these are the correct steps, I'm not on an XP computer now to try it).
Search for a Restore Point prior to the date which you began having trouble (if System Restore hasn't been activated, there may not be any restore points available).
Let us know if this works or not.
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Posting Maven
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since Jul 2004