Have you ever uninstalled a program only to find it still listed under Control Panel’s "Add/Remove Software" list? That ghost entry in "add/Remove" is an annoyance, and impossible to delete by normal means: If you click it, and select Uninstall, you simply get an error message.
Reader Edgar Sanchez, who runs http://www.edgarconsulting.com in Chicago, offers this simple way to rid your Add/Remove menu of such ghosts:
Use Registry Editor (Regedit) to delete the registry key that contains the name of your program in the following registry key:
Under this key, there are number of sub-keys, each representing an installed program. To determine which program each sub-key represents, open it and find the following values:
DisplayName – The value data for DisplayName is the name listed in the Add/Remove Programs tool.
UninstallString – The value data for UninstallString is the program used to uninstall the program.