Windows 7 lag


i got a problem with my computer. its lags all the time even when im doing nothing... it run smothly but every few sec there is a lag even the mouse and sound is lagging. it started when moved to this school and they only got wireless so i got a linksys WMP600N adapter with dual-band so i can use the net here but after that it started lagging. any help?

my specs are:
I7 920 processor
6 gigabyte ram
nvidea geforce gtx 285
asrock X58 motherboard

if you need more just tell me


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