Cannot install Avast because BFE service not running. This is sometimes disabled by a virus or malware. Check if the service is running, and try to restart it. If you get permission issues or it’s missing, there are two files here: Http://mail.vmi.co.uk/bferepair.zip which will fix the problem. Start with the registry file first. (Note: Registry file is W7 only).
IT Support Blog 