Under some circumstances, uninstalling Firefox 3.x can cause the GroupWise 7 Windows client spell checker to break, causing crashes whenever the spell checker is invoked.
Previous suggested fixes, including replacing \windows\system32\msvcrt.dll do not always seem to apply to or work with newer versions of Firefox and/or GroupWise 7.
The Firefox uninstaller does not seem to remove shared components or registry keys, at least when using Firefox 3.5 or 3.6 on a Windows XP SP3 system. Complete dumps of the file system directory listings and system and user registries were compared from before and after Firefox was removed.
However, the Firefox uninstaller leaves a number of registry keys behind – those registering it as a handler for files and protocols of various types. These “dangling” references may be the cause of the problem.
In order to fix this, set your web browser default back to Internet Explorer, at least temporarily. Click on your Windows "Start" menu and select "Set Program Access and Defaults". Then select "Custom" and click on the down arrow icon. Set Internet Explorer as your default browser, it seems to immediately fix the problem in tests.
If you have Firefox installed at that point and you use "Set Program Access and Defaults" a second time to set the default back to Firefox, the GroupWise spellchecker continues to work.
Disclaimer: As with everything else at Cool Solutions, this content is definitely not supported by Novell (so don't even think of calling Support if you try something and it blows up).
It was contributed by a community member and is published "as is." It seems to have worked for at least one person, and might work for you. But please be sure to test, test, test before you do anything drastic with it.