MS Access: Jet Database engine error has me stumped1

Ok here's the scenario. I have a form that has 2 subforms so it is pulling from 3 tables. the tables have the following record counts in them

table 1: 70,000 records
table 2: 16,000 records
table 3: 18,000 records

These are all tied into a data entry form. Here's my problem. I'm getting "The Microsoft Jet database engine stopped the process because you and another user are attempting to change the same data at the same time." I've researched and it says that it is due to corruption.

Here's what I've done. It's set up with cascading deletes from the main table so I started checking blocks of data and just when I think I have a block of data narrowed down, I error out again. It seems that if I reduce the number of records in half I can't recreate it no matter what block of data I use. Does this make sense? I've tried compacting and repairing and using JetComp.exe but no luck.

Please somebody, my client is ready to kill me and I can't figure this out. Any help would be appreciated.

You could try downloading the access database and running a compact/repair from within Access, then re-uploading the repaired db.

This problem happened pretty often with Access 97 but less frequently with Access 2000, usually it's a memo field corruption.