Have you got Windows automatic update on? With a reload, there might be a lot outstanding!
Try going Start/Settings/Network Connections/"Your Provider" and see if the 'Activity, Received, Bytes' is increasing all the time.
I had this symptom on one of my machines. Rebooted it and it stopped. Never did find out what was causing it though, there wasn't anything 'extra' on the machine. (Doesn't help you, I know, but at least you're not alone!)
Also, we'll get your post nearer the top again.