On Windows 10, you can use the DISM command tool to repair the local image, which you can use with the System File Checker ...

Learn how to boot into Safe Mode on Windows 8 with our easy-to-follow guide. Safe Mode is a diagnostic startup mode that allows you to troubleshoot and fix various issues with your Windows 8 system.

I am trying to get into safe mode so i can run a virus fix, but I cant boot the computer to get into msconfig and pressing F8, selecting safe mode, and then Windows XP Professional, leads to this ...