1. Download again and uninstall using the newly downloaded setup.
2. If that doesn't work: reinstall using this new setup and then uninstall.
i cannot uninstall the said program, when i clicked remove this message appears: The CRC sum of C:/Program Files/Avira/AntiVir PersonalEdition Classic?SETUP.EXE has been changed! This could be due to a virus! Do you want to shutdown Setup? When i clicked OK still nothing happens. Please help what should i do....thanks