Windows 7 pro Dell that is in a small domain. no GPOs applied. I can access advanced network setting and can click to enable network discovery and file/printer sharing but settings don't save. I can't access Windows firewall, nothing happens when I try to open it in Control Panel. It is started in Services. I can stop and start it but can't access it. I have used SFC, Rkill, Roguekiller, Malwarebytes, and installed AV deep scan (GFI managed AV agent) none of which found anything significant. Windows update works normally, IE works normally. I also ran tweaking.com all-in-one windows repair.