A clean reinstall is always a good option, like getting a new computer - except better since new computers have corrupting bloatware larded on them.
You might want to try running awhile with the bad RAM removed.
To run an elevated Command prompt, type CMD in start Search box, right click to Run As Admin and type sfc /scannow to check integrity of System files.
A Repair Install reinstalls the OS while keeping all Programs, files and settings in place. It is next best to a Clean Reinstall since corruption can be imported in Settings.
Neither will remove a virus, which needs to be done by using a virus scan like superior free MS Security Essentials and Malwarebytes. I would also run Spybot S&D from Safe Mode (tap F8 at bootup) after installing and updating from Desktop.