Thanks for all your help I took the cluster group containing the instance off line and started it in single user mode. Had to use the -m "sqlcmd"...

Basically the trigger is trying to insert a record for each logon Unfortunately, I didn't fully qualify the table and as a consiquence it is reporting as invalid.

I'll get...

Thanks

Yes I've tried that but I can't connect to the instance (because of the LOGON trigger problem) and thus can't get to the point where I can enable remote access...