[saltman]

catching back on here late. you should run a checkdisk on the hard disk to see if it has bad sectors. right click on the drive in the my computer. go properties. go tools. use error checking tool. will require a reboot and a lot of time to go through the scandisk deal. It will tell you if you have bad sectors.

The idea of a failing power supply is another good idea. Perhaps your system has begun to be too much for it. Do you have atleast 375 watts preferrably 425. There are places that give you values that each devices uses. You can then total them up to size your power supply.