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It could be either, but to first find out if it is a software issue or even a nasty virus, you should first do a good clean up.
switch sys restore off.
make sure you have all the latest deffs for you AV.
Run a full virus scan.
Also run a good reg cleaner.
Aswell as running spybot and Adaware.
make sure you have the latest drivers for your graphic card.
Also take your scanner/printer/camera so on out.
After all of that switch your Pc off and on again and see how it is, (if you are allowed to get that far that is.
If all works out well after that. You need to add your scanner back on its own see how the computer behaves and carry on until you have everything installed again, on the way maybe you will find it was a scanner or printer being the problem.
Now if all else fails above you now need to work on the hardware. If you do not mind going into your case,take out 2 sticks of your memory leave 1 in and run your comp see how it is, as this may yet be down to a faulty stick of memory. Go through each stick always just trying 1 stick at a time.
Now if it is not your memory you need to take out your sound card and run the comp see how it is.
If you have a spare old graphic card you should test the graphic card.If you do not have a spare graphics card to test then leave your graphics card out and use the GeForce2 MX graphics integrated chip on the motherboard, go into the bios to turn it on.
I guess it is a matter of a progression of testing each item until you hopefully find the problem. if after testing everything you possibly can and you still have problems you could try a fresh reinstall of the os. If that does not do it then it may well be a motherboard problem or power supply problem.
Good luck bud.
Sorry for any bad typos.
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