after you install winrar, open it and then open the folder with your rar files. click on the .rar file or highlight all the rar files and then click the "extract to" button at the top. i would recommend creating a folder within the same folder you have your rar files in - that way, you can easily find them. after you extract the rarred files, you may end up with .cue and .bin files (use nero to burn an image to your hdd) or a .ccd file (in which case you'll need clonecd to burn the image).
if this is the case with the app you want to use, and you have any questions, please feel free to email me at email@example.com