I recently built my computer about 1 week before Christmas 2012 I was very excited and got it to run. Very fast and smooth until last night its choppy playing ALL my games and sometimes choppy on youtube videos. I would play Crysis 2 1080p very high settings and get 35-45 fps and about the same for BF3 1080p med or high settings. Now when I play either one I get about 20 fps on the same settings and even if I lower the settings it stays at 20 fps.
I remember playing Battlefield 3 for a hour or so perfectly fine until in the middle of the game is started becoming choppy and slow. Since it was unplayable I quit the game.
I've ran Norton to see if I had any viruses and it said I didn't only cookies which it removed and still no improvement.
Defraged my HDD no change same with disk cleanup
My computer specs are
AMD FX 4100
Gigabyte AM3+ 970A-DS3
8GB 1600Mhz DDR3 RAM from Corsair
500CX bronze plus PSU from Corsair
500GB 7200RPM HDD Caviar Blue
AMD XFX 7770 1GB Graphics card
LG Seasonic DVD Player