I have an HP desktop running Windows 7 Home and there is some problem with "Diagnostic Policy Service". It will not start and I can not connect my wireless network adapter to my router. Also I can not turn on Windows Firewall. I am thinking that there is spyware or malware on the PC. Is there a way to fix it without having to do a full system restore? If I have to do a Full system restore, what is the function key to press at boot up? I thought it was F10 but that is not it.