To run Windows on your Mac you will need a copy of Windows. Apple provides Boot Camp with Mac OS X to allow Windows to be installed alongside Mac OS X. There are commercial applications that run Windows within a window on the Mac. (See links below)
I'm assuming you're referring to Apple's Get a Mac ad campaign. The Mac is played by actor Justin Long and the the PC is played by voice-actor and author John Kellogg Hodgman. The Mac actor is Justin Long
The best place to find a used Mac is at a commercial store in which is located in various locations such as malls or shopping outlets. A Mac can also be purchased on the online Apple Store or on eBay or sellalaptop.com
A professional program - DVD Ripper for Mac will help you convert commercial encrypted DVD or homemade unencrypted DVD to MOV on Mac. After conversion, you can play the DVD movies with QuickTime without limitation.
There are many famous Christmas commercials. However, there are few that are the most enjoyable and memorable. These include: the Mac n Cheese commercial, The Coca-Cola commercial, and the Jello Jigglers.