If that was one of my ciients' databases, I'd be scripting, exporting and recreating it. Probably someone hacked the system tables back when that was a SQL 2000 database and hence there are no clean backups any longer.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability