We have a Wi-Fi router with through which we both connect to Internet. But when my friend starts his laptop, after sometime, Internet becomes slow. Why? How should I fix this? There is no torrent or other download manager running in the background in his laptop. Operating System: Windows Vista. Wi-Fi router: Linksys
Update: I ran tcpview on his computer, there was one btdna.exe. It was something BitTorrent related process. May it be the problem? There was no torrent leeching/downloading from his computer, though.