I read your post again and all we have is a symptom and nothing else. As it stands you could reload the OS and drivers and hope.
Hey people i reallllly hope you can help.
I play WoW a lot (World of Warcraft) and my new machine got 60-80 FPS (Frames Per Second) with max graphical settings and stayed that way for about a year. it just recently started bogging down and decreased to about 15-30 FPS and it's really annoying even with graphics down all the way i only get 20-40 FPS. It was getting so annoying i decided to reformatte my hard drive and everything, this is the part that really pissed me off, it did not improve my performance in WoW at all, i was expecting it to run like new as it should, but i guess it is something that reformatting can't fix and i don't know what
Backround applications isn't the problem, virus isn't the problem, my graphics card is working properly, I'm just clueless to what the problem can be.