Drive mapping occuring multiple times

I have a group of users running a login script to map drives, it works fine. During the day one system starts mapping all the remaining unused drives to one of the drives that is mapped locally. It is like a net use * //server/share command that runs over and over again until all the drives are mapped. I have looked for a batch file on his system w/the command and found nothing. Not sure if is someone is messing w/the user or something is odd w/the system.
System NT4 spak 5, running MS Office 2k, AutoCAD, Microstation and Rebis.