Dear Avast, I use this antivirus since 7-8 years, I always was happy. Now, starting with 2015, you are doing something very bad against customers. Once every 2-3 days you force to pay for another Avast version, but the worst thing you do is send messages saying " your pc is slow" Your pc has GRIME". That's not true because I detected my pc with other programs and is clean. I don't believe you are doing something good, in this way you force people to disinstall Avast and use another antivirus, and I am really thinking to do that.