Have you tried the system repair from the OS cd? That might help to restore some of the deleted files of OS. The files might have been deleted because of the viruses. So try to system system repair the OS.
But I'm not quiet sure if this method would work it'll try to fix the System. But it might worsen the problem because there might to much program that is running in your computer that it can't support it. So It'll be good if you star to salvage some file by installing the hard drive of the computer to other computer as a slave then start accessing it and get the needed and important file on it. And resolve it by reformatting method.
But still try not to lose hope there might be some other ways that I don't know. But still if you can't access some programs of the windows it'll be really hard to find a way to fix it.
But I'm not quiet sure if this method would work it'll try to fix the System. But it might worsen the problem because there might to much program that is running in your computer that it can't support it. So It'll be good if you star to salvage some file by installing the hard drive of the computer to other computer as a slave then start accessing it and get the needed and important file on it. And resolve it by reformatting method.
But still try not to lose hope there might be some other ways that I don't know. But still if you can't access some programs of the windows it'll be really hard to find a way to fix it.