Vista stutters while downloading

Im using vista home premium 32bit on my acer aspire 8930 laptop.
Problem is crackling noises in audio, glitches in video and mouse
stutter.
These problems appear ONLY when wlan indicator flashes.
For example, im downloading something on the background and watching
some video, but when i quit downloading either by pressing wlan off or
closing download everything continues smoothly.
Another example, im watching something on youtube. Glitching,
stuttering and crackling last just as long as video loads. When video is
fully loaded and wlan indicator stops flashing playback is perfect.
And finally, its not just video, if wlan indicator flashes(opening
websites, chatting in msn, lan or internet games.) my mouse stutters and
ALL audio is messed up, even if no video.
I dont have a cable to try without wlan.
I have done full virus scan with aviras latest updates, all clean. I
have tried to close firewall too but no effect. Wlan card is intel wifi
5100 if i remember right, and there are no newer driver than what i have
now and i have tried reinstalling the same version just to be sure.
I have also noticed that downloading causes cpu usage go 90-100% while
download is in progress and go to that normal 0-2% when done.


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meitsicom
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