|Looks like you install it using the merge option.|
If it's zipped and you can't unzip it on that computer then use a different computer and burn the extracted REG file to a cd or copy to a floppy or flash drive--whatever the ailing computer can use. Then follow the 'usage instructions' on the download
Edit You did download ExeFix_Vista.zip, right? And not their so-called 'recommended download' which has nothing to do with fixing the problem.
You're not really green until you're soylent green.