|Not sure which bits you mean.|
1. Do your exe files show up on the computer with some other extension, if so what is the extension?
2. Were you unable to download the fixes?
3. If MalwareBytes won't run, then download it to a flash drive on another computer and run it on this one. If it won't run try changing it's name and exe extension to any of these (try each one):
The reason for all this is that I think you might have a virus that is blocking it and the name changes might fool it.
As an alternative, it could just be that Windows has got screwed up. You could see if System Restore will run, in which case choose a date before the problem came along.
Always pop back and let us know the outcome - thanks