my computer runs smoothly but after a bit it will lag?

Q: im seriously getting fucking pissed off with my computer. i have a great computer but ever since a month ago it will lag uncontrollably for no reason. it doesnt matter what im doing, the lag will effect everything i do, from youtube videos to videogames. i have an nvidia 8600 gts, 3gb of ram, 256 gbs hard drive. i thought it was my wireless internet but it isnt because when i turn off the internet it will still lag after a bit. no i do not have spyware or any other virus i scan my computer frequently with norton anti virus o and yeah its not overheating and my cpu usage isnt high ive ran disk cleanup and disk defragment and i still have this problem

A: It looks like you could have Spyware. You can remove Spyware or viruses with a free widely acclaimed Spyware and virus removal program called Spybot Search & Destroy. You can get Spybot S&D here: http://www.safer-networking.org/en/index.html

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