Just so you guys will stop whining:
Download it again. Find another ROM site where you can steal games from hard-working game developers.
When you finally find that compressed ROM. It should be in some common format. (ZIP, RAR, 7z). You can use winRAR or 7zip to extract all of that.
Now when you extract the file you downloaded, sometimes it creates a folder, inside the folder should be .r01, .r02, etc. Files.
Just right click on the .r00 or .rar file and click extract to here.
If none of that works, you're screwed.
Download it again. Find another ROM site where you can steal games from hard-working game developers.
When you finally find that compressed ROM. It should be in some common format. (ZIP, RAR, 7z). You can use winRAR or 7zip to extract all of that.
Now when you extract the file you downloaded, sometimes it creates a folder, inside the folder should be .r01, .r02, etc. Files.
Just right click on the .r00 or .rar file and click extract to here.
If none of that works, you're screwed.