Extract the patcher using Winrar. Notice how the extension still says .rar, that means it's still compressed. If you don't have Winrar you will unfortunatly need to get it.
Trying doing a simple yahoo/google search for a Winrar download, preferably with a virus checker and finally extract that lil bugger of a patcher. Noooow you should have a .exe that can be opened.
If you do have Winrar and I'm just blind, Winrar isn't showing up on the common programs list and you'll need to use that little "Browse" button on the bottom of that box and find it. Set it as the default for .rar files.
Easiest way to extract now is a right click -> Extract Here