Using 4.91 sp2 on hundreds of Dell Dimension machines (Windows XP sp2)
connecting to a Netware 6.0 sp5 server

A few of them exhibit the following odd behavior:

Randomly during the day - a login box appears with the user name NETWARE
SERVICES already filled in. Not much the user can do about it except click
cancel about 10-15 times until it goes away.

Uninstalling and reinstalling the client does not resolve the problem.

What's up with that?