I had a thread about this previously.

About a month and a half ago i over-hauled my system, new mobo, new cpu and new ram... then ended up needing a fresh windows install because of hard drive issues. So when i got everything back up and running utorrent which i'd been using for a pretty long time started crashing my system. I love utorrent, however i could not actually fix the problem with utorrent, instead i reverted back to using bitcomet.... which 'works' but i dont really like in comparison to utorrent.