- Uninstall all other virus scanners or ad/spyware scanners from the installed programs list, under Control Panel → Programs and Features or Uninstall Programs or
Settings → Apps → Apps & features.
- Also, look for Avira Antivirus under Uninstall Programs.
Click the app and perform a modified installation.
- If needed, restart the computer. Avira Real-time protection, Web protection, and Mail protection will then be active again.