Are you planning to test the Windows 8 Consumer Preview? Make sure you pick up a product key. Unlike Windows 7, you can’t skip this box and fill in a key later.
If you use the web installer, a key is generated and filled in automatically for you. If you download an ISO disk image and create your own installation media, on the other hand, you’ll need to type in a 25-character key.
Where do you get a Windows 8 Consumer Preview product key?
Microsoft has published two keys that anyone can use.
The ISO download page includes this public key:
The Windows 8 Consumer Preview FAQ has a different key:
If you’re eager to get started, go to this page: Download Windows 8 Consumer Preview.
I’ve got lots and lots of information to help you with your evaluation here: