Was running a newly installed antivirus program, found several viruses, couldn;t repair so deleted the infected files. Now when I reboot, the start menu doesn't come up, can't do system restore even in safe mode so I evidently deleted some important files so I do I try performing a windows repair or what? If that is the answer, will it delete files and programs on the computer or not? I've never used windows repair so want to make sure what I'm getting in to before trying it.