|keturah, It's really easy. Just go to that link and (Use Right-click - Save as option in your browser to download the fixes) "lnk" in the File association fixes box and save it to your Desktop. |
To fix the association for a particular file type, download the corresponding fix from the above links table (Use Right-click - Save as option in your browser to download the fixes). Unzip the fix and extract the .REG file to the Desktop. Right-click the REG file and choose Merge. Note that you need to be an administrator to apply these fixes.
You would need to do the same for the exe file association fix.