Well I know for a fact that its not a virus, I diddnt see anything for computer problems so i just put the topic in here. Anyway ive done everything and i just cant seem to fix my computer. Ive tried reinstalling, That diddnt work so i put a new harddrive in becasue i figured my other one was dying. that diddnt work. if yoru curious its a western dgital raptor 10,000 RPM. 74 gb. Before i reinstalled I had my freind run hardware diagnostics on my computer, everything showed up normal. All my cables are plugged in properly. And yes i keep it clean, no dust. The issue with my comp is that im getting lower than average framerate loss in games that should run liek a charm with my setup i have. Intel core 2 duo 3.0ghz, 2gb ddr2 800mhz corsair xms2, nvidia geforce 8600gts 512mb, Antec earthwatts 500, and of course my WD Raptor 74gb. I play cs source, tf2, and Modern Warfare 2 mostly so i know the frame rate loss isn't caused by my hardware. well i hope someone can give me a solution. ah and i go from 60fps to like 40 and below in less than 2 mintues of gaming, and from there it just gets worse, my computer will lock up and I have to restart. when it locks up my monitor will start flashing, not really flashign, but like a continous flickering like its going on and off. well i hope someone can help me becasue i have no clue whats wrong.