After turning it off, compact the database:
Tools | Database Utilities
You may also want to decompile a copy of the database by entering something
like this at the command prompt while Access is not running. It is all one
line, and include the quotes:
"c:\Program Files\Microsoft office\office\msaccess.exe" /decompile
"c:\MyPath\MyDatabase.mdb"
If the problem remains, then tell us more about this query - particularly
whether it contains subqueries and stacked queries.
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