.rar are compressed or zip files. Right click and OPEN. If there is an installed unzipper, it will work automatically to give you the usable .exe files.
If it doesn't work, get ExtractNow from here http://www.bleepingcomputer.com/forums/topic3616.html
When you OPEN your .rar file, a box will popup and you click on EXTRACT down the bottom. A new folder with the extracted files will appear beside your .rar files in a couple of seconds.
ExtractNow will open most types, but if not then get 7ZIP from the above, slightly more complicated but will open just about everything.