wireless netcard die during download

I used Dlink 120+ wireless netcard in window xp sp2. The driver installed is from the original Dlink installation CD. It works fine for internet roaming. But when I try to download something, it always lose the connection in 10 or 20 minutes. In that case, the status of wireless network shows correct (connected), but I can't access internet any more. And the usb hub seems die as well, because I even can not disable or remove current wireless adapt through mmc.exe. Any operation try to change the status of connection will cause system hang up. And usb can not find new plug in device at that moment. In additon, the computer can not shut down normally. After restart forcely, everything seems fine again. Why?

Thanks for any information.

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