Your database may be partially corrupt. Try these steps.
1. Go to
http://support.microsoft.com and click on the Downloads link. Get
these:
Service Pack 3 for Office 2000
Service Pack 8 for JET 4.
Install them both.
2. Repair your database:
Tools | Database Utilities | Compact/Repair.
3. Create a new (blank) database:
File New.
4. Immediately uncheck the boxes under:
Tools | Options | General | Name AutoCorrect
For an explanation, see:
http://allenbrowne.com/bug-03.html
5. Import everything from the problem database:
File | Get External | Import
The sequence does matter. You need the latest versions working for you in
this rebuild process.