[Martin Reyerink]

I had a similar problem when our SQL Server had a critical update installed
which affected MDAC. The problem was fixed by renaming / delting user
profile's which had this problem. The problem is caused by a corrupted MDAC
config for users office profile. We tried everything else (MDAC service pack,
Office service pack, Office Repair) before this method worked.

When deleing user profiles all there customised setting will be deleted..