I haven't personally seen any pop ups.

But for every nasty, leading virus software have databases where you can look up what it is exactly when it is detected, and what you need to do to fully remove it (once you know what it is). Or google.

Which can be several steps and need some manual removals such as registry entries, or start up entries...but you start with a nice sweep of everything 🙂

Some things are easy, some things are more difficult and a decent scan will tell you if the program has successfully removed the offending program fully 🙂