Novell Client hangs.

OS = XP SP2. Client 491 sp5.

If the novell client is installed it hangs after pressing CTRL + ALT + DEL
and sits there for a long time. If there is no Novell client the PC works
fine. I've checked for any unusual services or programs in the startup
folder. Anyone come across this before. The disk is fine. I have uninstalled
the anti virus software in case that was the problem. I have removed any
registry entries for Novell or NetWare. Any suggestions?