Re: Virus/Trojan has disabled my Windows Installer service, sound, WiFi and much more. Hardware and Software Information Security by crunchie Try the solution given here; [url]http://answers.microsoft.com/en-us/windows/forum/windows_7-system/trying-to-run-sfcscannow-and-response-is-windows/60895ef9-357f-46d3-8e8d-449ae2d2d4c2[/url] Let me know how you did.