Multiple drive mapping

I am having problems with a NT Workstation. Its seem to be mapping multiple drive letters for the same folder

Ex: you boot up the computer, Login, and your mapped drives are all set.
you work for awhile and you notice that you have an E:\ F:\ G:\ mapped to the same folder as you Z:\ drive

i have deleted find fast
and i have at least 3 doc that could be the culprit

please let me know of any info you might have on multiple drive mapping

Thank You For Your Time

jjoyce@carlilemacy.com