hi,
Yes Bittorrent probably has caused this. It depends on what you are downloading and from where.
I am going to assume (as an example) that you are downloading some free software. While the software may be legitimate the sites that hosts these torrents are probably not.
If you need to download torrents i recommend using uTorrent over BitTorrent. Also try using AVG with when searching as AVG is pretty good at spotting the "bad" torrent sites.
Reboot in safe mode and i would do a quick roll back see if that stops the BSOD
Hope this helps
James