Hi, I've been having this problem over and over. I uninstall it, and re-install it and sometimes it works and sometimes not. I have restarted the computer every time and nothing. It happens also with other Torrents softwares, not only BitTorrent. I also re-download the setup.exe or the torrent files to open them with the BitTorrent. I've read some topics but haven't solve the problem so far. I'm the only one using this notebook, one user only (admin, of course), don't have any virus, malware, spyware, nothing. It started failing yesterday. Thanks!!