I have used Avast free version for several years. Several months ago, I uninstalled Avast (at least I thought it was uninstalled) and installed the Comodo Internet Security product. Comodo has a higher learning curve than Avast but their product is both comprehensive and free.
Now regarding Avast; just this morning Comodo popped up and told me overseer.exe was trying to create a file. I looked it up and found out overseer is an Avast file that was left behind after uninstall. I checked and deleted some folders Avast had left on my PC, although I reckon there are still more and also I have not entered the registry yet to check there. It seems to be a common practice for software Devs to leave part of their installation behind, possibly for telemetry purposes. Avast is one of the biggest if not the biggest player today in the Anti-malware world. Obviously, they want to protect their market share and become even bigger, so these aggressive tactics should be expected. A suggestion would be to use an uninstaller program like Revo Uninstaller. There are also many others that are similar and they specialize in removing all traces of software installations, whether folders, files, or registry entries. I think Avast is a good product, but I recommend going in with your eyes open.
