try downloading ‘married with children’ from mininova. the complete 11 season torrent is 41GB. i had BC .69 after ~15 mins of downloading the whole machine hung. nothing helped, completely frozen. had to switch power off. updated to bc 0.70, problem remains exactly the same.
hmm. azureus seemed to have to same problem, though it lasted ~15 min longer. uTorrent seemes to be fine after few hours. pc is used for developing and is stable for sure and has been for a long time. no viruses or spyware has been found in that machine. and bc worked just fine before that big torrent.