i use a wireless adapter, and some reason when the computers not in use, it still keeps downloading packets.

On the WIRELESS NETWORK CONNECTION STATUS, its says 14,093,039 bytes sent, and 319,948,294 bytes received. im not even on the internet whe this happens, no downloads or what so ever.

If u do the conversion, 10 mb sent and about 300 mb received.

why does it keep downloading packets? is it a virus? i use vista.
if it is a virus, help me fix it plz