Greetings,
Did you try to remove and then re-install Avira?
- First, uninstall Avira;
- Use CCleaner, available on the following link: https://www.piriform.com/ccleaner/download
- Start CCleaner (there should be a shortcut on your Desktop or where you downloaded it);
- Go in Options tab > Advanced, untick Only delete Windows temporary files older than 24 hours;
- Then in Options tab > Surveillanc...