I think you can use your tech guy, or could do it yourself.  As a precaution you may want to make sure you have backed up whatever files you don't want to lose before you start.  Choosing the option to keep your files during the reinstall process should work, but I prefer to err on the side of having a current backup just in case.

I did a full backup on an external drive first before starting the reinstall and it resolved the problem.  My data files were unaffected but I had to reinstall all my programs.  The backup might seem redundant but I didn't want to chance losing necessary files.