First, Delete Avast and uninstall programs.
Restart Windows in Safe mode and run this utility.
Use the Browse button to find and point it out.
Then the program asks for confirmation to delete the folder, click Yes.
After successful removal, the program asks for a reboot, agree.
You can here delete the folder AVAST Software in Program Files.
After rebooting download and install the latest version of the free utility Ccleaner.
Run Ccleaner and clean the computer and registry from the garbage. To clean the registry, click the Troubleshoot button, then Repair.
If the above steps don’t help you to reactivate avast free then you can follow a blog by following above link to learn more step by step different instructions…