Microsoft has offered some version of System Restore on recent Windows operating systems. This lets you undo system changes that are affecting performance or causing other issues. System Restore on Windows 8 makes it easy to restore a PC to an earlier state, referred to as a "restore point." You can also wipe a PC clean or reinstall Windows 8 altogether. IT administrators can guide clinicians through the process.
It's worth noting that System Restore will delete all files, settings and applications, except for those that came with the PC. If that's a concern, you may want to try a System Refresh first. Also note that System Restore isn't available for Windows RT.