To install and set up Parallels Desktop 7 for Mac, you need:
Note: Your Mac must have enough RAM memory to use Mac OS X and its applications plus the memory required for each additional operating system (and its programs) that you want to use simultaneously.
To identify your computer's processor, memory, and Mac OS X version, choose Apple menu > About This Mac.
For a list of operating systems that Parallels Desktop supports for use with your Mac, see Supported Guest Operating Systems or go to http://www.parallels.com/products/desktop/system-requirements/.
Install Parallels Desktop
Upgrade Parallels Desktop