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Step 1 - Try restarting your computer, maybe it is overheating.
Step 2 - Maybe your computer is running to many programs, press control + alt + delete and close some programs on task manage.
Step 3 - You could just not have enough memory on your computer at all, go to control panel and delete some of that junk taking over your computer.
I hope I helped you out a bit, - Drucrazy