Hi, My computer is doing very much the same thing at times, and I'm considering the possibility that I may need a new graphics card (or fan), as something inside there(I haven't opened this one recently) is beginning to become quite noisy.(sounds like one of the fans) It occasionally reboots, opens up programs, closes them down, the pointer sometimes goes completely mad on it's own. I have checked for viruses, trojans, you name it, I've scanned for it, but nothing's hiding there. Before I attempt to change the card though, I am intending to run 'scandisk' from my startup disk. I haven't run that for a long time, and it's repaired issues with other hard drives in the past. (Or helped, anyway) I, also, have Norton system works installed, and run that on a regular basis, which detects no problems. Hopefully, this might help to solve both our problems. M.Sayer The NOSPIN Group is now offering Free PC Tech support at our newest website: http://freepctech.com