And after you have a Registry problem.....

Even if another program has fixed that problem for you, it's still a good idea to run Command Prompt in Administrator mode, and use the DISM.exe tool, which
means 'Deployment Image Servicing and Management' tool, and that will restore your operating system's Image to its original condition for you. It scans it in 20% sections, and draws a dotted line between those end brackets, until it has reached 100%, and then it reports what it found.....

And with that successfully completed, you know you're OK and can get on with your day. This also works for any other situation in which you may want to confirm that the operating system is maintaining its integrity, and it doesn't take nearly as long as reinstalling the system might.