Of course. I'm taking about the the emulator. I went to the website and downloaded the rar but didn't get much passed that point because I couldn't figure out what to do from there. I'm guessing there are instructions somewhere but I can't figure it out now since I'm not in my house at the moment.
I'm assuming you mean the .7z file as Dolphin downloads aren't distrusted as .rar files (make sure you download it here). After that you will want to get 7-Zip to extract the .7z file and then run Dolphin.exe in the resulting folder.