Go to the Start menu -> All programs -> SolidWorks PDM -> View Setup.
If this fails then you have left over entries in the registry and will need to consult your VAR for how to fix this.
Thanks. That wasn't working. I found the answer by Jason Spansel on another thread and it worked:
"You need to go into the registry of the computer and delete the vault view from there. I get this all the time.
Rename or Delete: HKEY_LOCAL_MACHINE\SOFTWARE\SolidWorks\Applications\PDMWorks Enterprise\Databases\(VAULT NAME)."