Avast is one of the popular internet security software. Sometimes users do face billing problems which can happen due to conflict in windows service configuration. Try reinstalling the software in order to resolve it. The software can also face multiple error codes which can usually be resolved through common troubleshooting steps. Make sure you’re in good internet coverage area and the application is updated. You can download the Avast software, free of cost through their official website. Another common trouble users encounter is forgetting their password. There is nothing to worry about, just go through the verification process by entering the code and change your password.