Compacting error when cloding database

[Jay]

I have an Access 2000 database that is used by a staff of
sales people. The sales guys in the field email their
database to the central office to replicate it with the
one on the central office's LAN. It has been working great
except the following message error is sometimes coming up>

"Microsof Access can't deletee ***.MDB after compacting
it. The compacted database has been named db1.mdb"

What is causing this error. It is happening on the master
database not the replica. Any ideas?

Thanks

Jay