|Go here and use the EXE fix:|
If necessary, download the above file on another computer then transfer it using a flash drive to the one with the problem.
If this fixes the problem then run your AV scans because this symptom is mostly caused by a virus. I would also install, update and run the MalwareBytes freebie because this often finds and fixes things that AV's miss.
Always pop back and let us know the outcome - thanks