Recently I started receiving a runtime error everytime I exited out of word and excel. The error reads -

Runtime error "5"
Invalid procedure cell or argument

I use word as my editor in Outlook so it is also activated everytime I close out of Outlook. The error doesn't seem to be affecting the programs, I just can't seem to get rid of it. I am running Office 2000 Developer, I reinstalled it this morning and it hasn't helped. How can I fix this? What may have caused it?