Access Violation in groupwise

We have Netware 5.1 SBS sp3 with GW 5.5 sp4.
On my win2k prof workstation I am getting Access violations evertime I open GroupWise.
I have installed the winnt messaging system.
I have tried uninstalling the messageing and GW then reinstalling.
The log file shows:

Event Type: Information

Event Source: DrWatson

Event Category: None

Event ID: 4097

Date: 5/31/2002

Time: 8:27:41 AM

User: N/A

Computer:

Description:

The application, release\GrpWise.exe, generated an application error The error occurred on 05/31/2002 @ 08:27:41.361 The exception generated was c0000005 at address 005B247C ()

It givesthe same address every time. Could this be a memory Problem????