Access violation on login

One of my users is getting an Access Violation after logging onto
GroupWise 5.5 at her workstation. She can logon to another workstation
successfully, so that would seem to rule out a problem with her mailbox.

The workstations are running Windows NT 4.0, SP6, Novell Client 4.60.202,
McAfee VirusScan Enterprise 7.0, and Microsoft Office XP. Any suggestions?

Thanks.