if this is not a production db then maybe your best option will be to kill all the connections backup the db detach the database delete the tranlog manullay and re-attach I really wound not recomend this but it will create you a new tranlog that is empty. Or back up the db in simple and dump the log with no_log then run dbcc shrinkfile.

the dbcc opentran will show you the connections type

kill spid where spid = say 17

terry