I haven't had any success with running dbcc shrinkfile on tempdb. In fact, I would not recommend it as I've run into problems (corruption in tempdb) that have forced...

Another thing to try (and this is not documented and is at your own risk, but I have used it a few times to get a seemingly unrecoverable db back...

Do you have the db_option for torn page detection set to on? If so, it may be shutting down(marking suspect) the database as soon as it finds a torn...