Install GRE installer using defaults From control panel: add/remove programs, select remove GRE. Before the Uninstaller even executes, GREUser is removed from the applist and the entry is removed from the add/remove programs list. This should be done after the user confirms to proceed with uninstallation, not before.
Discussed in edt bug triage. Plussing.
The problem is that CleanupAppList() is being called before the prompt is shown. The problem is here: http://lxr.mozilla.org/seamonkey/source/xpinstall/wizard/windows/uninstall/extra.c#1965 The fix is to have the above code be done in one of these places (not in all of them): http://lxr.mozilla.org/seamonkey/source/xpinstall/wizard/windows/uninstall/uninstall.c#117 http://lxr.mozilla.org/seamonkey/source/xpinstall/wizard/windows/uninstall/dialogs.c#313
The GRE installer is long dead