why is my computer seem to lag when i do anything?

i started to actually notice this like a week ago when i was watching TV shows online that i missed, i normally click the link to watch the episode then let it buffer all the way now all of a sudden even when its fully buffered it gets choppy like the video freezes but the sound continues to play then within 3 seconds the videos goes back to place. Now its getting worse my computer in general is starting to lag even when im typing this it tends to freeze and then puts what i typed in. This is really getting annoying this is a pretty new computer no later then 2 month... with about a 1T of space left... im running a system scan now for possible virus's but i haven't downloaded anything yet.. please someone help me. thank you
 
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