HOW did you uninstall Avast? It looks like all or part of it is still there. If you are getting Avast popups, then it did not uninstall. If you have not already done so, click on the link in my first post and use the Avast Uninstaller tool to remove remnants of Avast. If you have already run the Avast Uninstaller and there are still remnants present, then you will have to look for them in Services and in the Startup programs and disable them there. Once that is done, you may be able to deleted them from the appropriate folders, if you can find them.