First check SQL Server error log ?

The error means: You have at least one corrupt page in the database that's being hit during recovery. This means you can't access the database unless you put it in emergency mode (using ALTER DATABASE PIS SET EMERGENCY). You can then poke about an extract data BUT it will be transactionally inconsistent as recovery has not been run. If you don't have any valid backups, or they're too old, the only way to fixup the database is to use emergency mode repair. See Paul blog post at http://blogs.msdn.com/sqlserverstorageengine/archive/2006/06/18/636105.aspx