Dec 13, 2009
Remove Uninstalled Programs still in Add Remove Programs
Sometimes even after you’ve uninstalled a program, its entry still remains listed in the Add or Remove Programs list under currently installed programs. As time goes on, it’s easy for you to forget what programs you’ve uninstalled, so when you see the entries in Add/Remove, you’ll assume the programs are still on your hard disk, but when you try to uninstall them you’ll receive an error message – because the program has already been uninstalled

Read the original post:
Remove Uninstalled Programs still in Add Remove Programs