here is a good tip from PCMAG
Sometimes, when you uninstall a program, its entry remains in the Add/remove programs listing. Or you might delete something manually and find that the entry remains in the list of uninstallable programs. You can clean up the list and remove programs that you've already uninstalled. Run Regedit and navigate to
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall
From there, you can remove any unwanted items, which are in the form of Registry keys.
