Ok so when I try to play on Team Fortress 2, after about 10 minutes of gameplay I will get kicked from the server with the message Something on your computer is blocking the vac system. You cannot play on vac servers.. (no really there are 2 periods). valve says to enable DEP. which i did. It didn't help. it also says to repair steam service. Didn't help. Then it says that its another program running thats interfering. I make sure nothing else is on when I play. I dont know what to do. Please help!