I'll try to make this short. I downloaded mods for a game, got a virus that made my computer run slow, removed it, computer was running fast again and getting high fps again also. Then about a week later it's starts running slow again can't get above 30 fps in LoL, where I use to get 300+ on ultra setting, same with other games. I thought it was the CPU overheating, so I bought a new fan. Go into a LoL match an even though I don't lag as much, my FPS varies a lot from 20 FPS to 71, so it couldn't of been my CPU, I am assuming my GPU because the temp right now is showing 75C, where my CPU is 40-45. Does anyone know what could be the problem? I bought two cans of air and used them both up on my GPU and motherboard, so I'm thinking it's not dust, could it be something else?