The Upgrade for WIndows 7 is available on Amazon.com as well as the Microsoft Store for Pre-Order. Windows 7 Home Premium Upgrade will only cost you $49.99, a savings of $70 from the suggested $120. Windows 7 Professional Upgrade will set you back $99.99 for a savings of $100. All versions of Windows 7 will be available starting on Oct. 22, 2009. While initial reports say that Win7 is extremely stable and should run on a wide variety of hardware you can ensure sure your PC is compatible with Windows 7 by grabbing Microsoft’s Windows 7 Upgrade Advisor. Windows 7 installation disks will contain both 32 bit and 64 bit versions of Windows… so no matter which you version purchase it will install on your PC.