I have the exact same problem and telephone support has no viable solution. In addition, when Grime Fighter installed it created a duplicate device for my PC and shows it in the device list. My OS is also WIN7 SP1 up to date - Avast Premier 2014.9.0.2013. My wireless works in all other applications. I tried all of the solutions suggested without success and additionally tried the uninstall reinstall approach. I humored telephone support, who thought my quarantine folder which contained some viruses and adware was the culprit, and performed an intensive full system cleaning to no avail. I don’t have the ability to use a wired connection so would appreciate any help.