This could be a lot of things, and we could spend a lot of time trying to get things working right.
Or, you could backup your stuff, then format and reinstall Windows and things should work OK (this discounts any hardware issues - and a dying hard drive can cause just such a problem).
The biggest PITA's with a reinstall are:
1) Installing all the Windows Updates (it should be around 100 for XP SP2)
2) Installing all the drivers if they're not included on your recovery CD/DVD
3) Setting up all of your favorite programs again.
But the benefit is that the computer will function as if it's brand new.
Should you decide to do this, I'd strongly suggest testing the hardware before you start.
First, use this free utility to see if there's any major issues with your system: http://www.sisoftware.co.uk/index.html?dir...n=sware_dl_3264
Then use this free, bootable utility to test your memory: http://www.memtest86.com/
Then, presuming that you've got a Fujitsu hard drive, I'd suggest using the DOS utility here (on a bootable disk) to run their disk diagnostics: http://www.fujitsu.com/us/services/computi.../utilities.html
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