this is a great application and it saved me a whole lot of messy stuff but a few things to take not of that need attention. I run the app with everything checked on it and my intention was to repair issues with firewall not turning on but then it messed up with windows defender which is my prime anti virus application on windows 8.1 i then run it again then it messed up with apps like music and video they were refusing to sign in at this moment i sort alternative solutions to fix the problem. Also i noticed that in the list there is no option to repair windows defender on its own i think that should also be included otherwise generally the application works well