The Windows 7 operating system is offered in several versions: Starter, Home Basic, Home Premium, Professional, Enterprise, and Ultimate. It's important to understand what features are contained (and not included!) in each version so that you won't be disappointed with your machine.
If you are going to use your laptop, computer, or workstation for any business or other serious purpose, forget about the Starter, Home Basic and Home Premium versions. Unfortunately, one of these is usually what's installed if you buy the machine from online discounters or in large electronic stores
However, all is not lost. For the first time, the Windows 7 operating system comes with all the features for all the versions. All a user has to do is "unlock" those features. That's where the "Anytime Upgrade" comes in. Open this package and you will find a code. Type in "anytime upgrade" on your machine, and you will see a screen that asks for the code. Type it in and voila! You are upgraded to Windows 7 Professional. No disks. No sweat.
It's great that Amazon sells this product at a good price. Windows 7 Professional includes a license for Windows XP and can run your older software (and drivers for older hardware like printers) in XP Mode. So when I bought my first Windows 7 machine and knew it came with the Home Premium edition, I did not worry, knowing I could buy this upgrade from Amazon.