Step 1: System Requirements
1 GHz 32-bit or 64-bit processor
1 GB of system memory
10 GB of available disk space
Support for DirectX 9 graphics with 128 MB memory (to enable the Aero theme)
Internet access (to download the Beta and get updates)
Step 2: Where to get it?
The product key is given to you when you download it, you probably wanna write that down some where.
Step 3: Burning the File to a DVD
There are many alternative programs as well such as Nero and Roxio.