Posted here because of the related problem with VBA, if anyone is experiencing problems with VBA applications.
This is clipped from a reply to a problem I raised with a slooooow machine at one of my clients.

...the desktop has exhibited two problems this morning:
(1) The McAfee virus scanner deletes temporary files, causing VBA code modules to be dropped during normal proccessing, claiming that they are infected with a virus.
(2) the machine is slower than slow.
Item (2) could be dismissed as a regular complaint, but it has just taken 15 minutes for Word to open and close 65 text documents of about 500 lines each.