Switching from WinZip to the default version.

My 45-day evaluation period for WinZip is over and I'm trying to figure out how to switch back to the normal zip program that came with Windows Vista. I needed to use WinZip on some occasions because the standard zip program didn't support *.rar files and a few of the addons that I have normally came in *.rar format. The rest are normal *.zip files. However, I can't use WinZip anymore and I can't find a way to switch back to the default zip program in Vista. Does anyone know how? Or does anyone around know of a free zip program that supports *.rar files as well but won't turn into a pumpkin on me like WinZip did?