windows 7 lags when connected to internet


i have a problem with lags as soon as im connected to the wireless internet in school where i live now. when i connect to the ap here the lags begins and makes my music, mouse corsor and everything else on the pc lag. it all started when i put in a linksys WMP600 wireless-N pci adapter with dual band. but when i disable the connection all lags ends and my pc works perfectly again. before when i used wired internet connection at my home everything was working as it should with no lags at all.

my specs are:
I7 920
6BG ram
nividea geforce GTX 285
asrock X58 motherboard

let me know if you want to know more

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