i have the same problem, as http://forum.utorrent.com/viewtopic.php?pid=743886#p743886 WinXPx32 SP2. All versions utorrent starting from 3.3.1.29905 and above (3.3.2.30303 - same) do not run. All versions starting from 3.3.1.29812 and lower work normally. Tested on 2 computers.