Block record from being viewed by other users. Access 2000

I have a flat-file front-end back-end access 2000 database that is used by 4 to 5 people simultaneously on a network. Each user uses a separate .mde file to enter data. The problem is that periodically record corruption occurs in the memo field of the form when two users are accessing the same record at the same time. I have fought this problem in different ways to no avail.
What I would like to do is somehow filter out any record that is currently being viewed by a user so that all others would be unable to access it and thus (hopefully) avoiding the aforementioned corruption problem. Does anyone have any ideas?

You need to split the database. The file corruption is the result of simultaneous use of a record by multiple users. You should always split the database if a database is being used by more than one person at the same time even if they are normally not accessing the same records.

There is no other quick way of getting round this.