|I would start with the EXE fix from here:|
If you can't download the above then you will need to download the REG file onto another computer then Save it onto a flash drive (don't Run it). Put the flash drive in your computer and run the file from there. Just double clicking it on your computer will run it - say yes to all prompts.
The strange bit is not being able to find your EXE files. Give an example please?
Sometimes EXE issues are caused by a virus, so when you get this going again run your AV scans and also download, install and run this freebie:
Always pop back and let us know the outcome - thanks