I have twice previously lost my system drive to viruses so stubborn that they defied removal. Prior to wiping or replacing my hard drive and re-installing my OS and programs, I did a Microsoft backup of my C: drive to external (USB) drives. Is there any danger that if I restore my backup to try to retrieve music/photo/game backup files, etc., that I could re-introduce the virus(s) into my restored system drive, or is that no longer an issue. Thanks for any assistance.