Yep, sounds like corruption.  I would try in this order:
1. Compact and Repair
If that doesn't work
2. DeCompile
   Start-->Run, Then type in
   msaccess /decompile "C:\Documents and Settings\Bozo\My
          Documents\DatabaseName.mdb"
   Compact and Repair again
If that doesn't work we are down to the ugly and tedious
3. Copy all your modules to text files
   For Form and Reports that Have modules, after copying their modules to
text, Set thier Has Module property to No
   Create a New Database
   Copy all the objects from the old database to the new
   Paste in your standard modules
   Open each form and report that had a module in design view
   Click on the Code icon
   Paste the original code back in place
Compile your database
Compact and Repair
Make a donation to a worthy charity and pray.