Which WinRAR do I download?

Hi, I'm not good with computers (yet) but which one do I get 32 or 64 bit? If it helps I have 32-bit Flash player, Windows 7 64 bit operating system and my laptop is Samsung Series 7 700G7C. I intend on using it for A pokemon emerald ROM and mincraft. I was thinking 32 but I'm unsure, thanks for the help.

Added (1). I'm not looking for an unzipper but I'm looking for which WinRAR but your suggestion is noted.

Added (2). Also anyone know any way to download it for free?

Get the one that corresponds to your OS so 64 bit.

7zip is the best of the free zippers / unzippers = www.7-zip.org

You need the same as your PC (in your case x64). However, 32bit (or x86) programs will work on 64 bit Windows installations but 64 bit programs will not work on 32 bit windows installations.

Also, just install the trial. You just get a nag screen when it expires, the program still functions fine.