Bob,
Backup the registry and/or export the following keys:
go to Start>Run, type regedit. Navigate to:
HKCU\Software\Policies\Microsoft\Internet Explorer\Restrictions and delete the NoBrowserContextMenu
entry.
There's also a policy for the desktop and right-clicking on the taskbar.
Look for these entries and delete them as well:
NoViewContextMenu and NoContextMenu and NoTrayContextMenu
reghakr