Did you do your extended maintenance? That is, canned air on all heatsinks, replace heatsink compound (simple wipe and new compound)?
Bob
i have a one and a half year old intel core i5[2nd generation], mother board - intel DZ68DB, 4gb ram, 1tb internal HDD.
os - windows 7 ultimate 64x.
my pc was running perfectly without a glitch until a week ago, and now it slows down and hangs for no reason i can understand, i even reinstalled whole os but it dint help.
pls tell me what the problem is and how to get rid of it

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic