Two instances of the GroupWise client show up in Add/Remove programs but only one works

The GroupWise client shows in Add/Remove programs twice but only one works. 

If the GroupWise 7 client has already been installed on a workstation by an administrator user, and if the GroupWise 8 client is installed by a different administrator user, a second instance of GroupWise is installed and the first instance is not updated.  To fix this problem, go to the Control Panel, then double-click Add/Remove programs.  Highlight the obsolete instance and then click Uninstall