Word on Mac OS X--"too many installations"??

[Denise]

Every so often when I open MS Word, I get the following
(paraphrased) error message:

"This version of Microsoft Word has exceeded the number of
installments allowed with this disk. Microsoft Word will
now close."

And it does. Usually if I restart the computer it's fun,
but what is that about? I have only used the disk once--to
install it on this computer so I haven't exceeded the
number of installments. Will a simple uninstall/reinstall
do the trick? Has anyone else experienced this?

Thanks.