Had an identical issue on Win7 Premium SP1, this solved it.

Just to keep this thread up to date: I’m running Windows 8.0 with latest avast! engine and defs. I’ve been seeing this issue for a long time. I used the recent solution and it worked: Disable avast for 10 minutes, go to Action Center, tell it to activate avast. All issues clear. I’m happy with that!

https://www.youtube.com/watch?v=5eqPZUxmbOY