It’s worth noting that most of these methods simply remove the “Activate Windows" watermark, and don’t actually activate your system. You still won’t be able to lift limitations such as not being able to customize your PC at all.
Transcript: Windows 7 is available in six different editions, but only the Home Premium, Professional, and Ultimate editions are available for retail sale to consumers in most countries. The other editions are aimed at other markets, such as the developing world or enterprise use. Each edition of Windows 7 includes all of the capabilities and features of the edition below it. All editions support the 32-bit (IA-32) processor architecture and all editions except Starter and Home Basic support the 64-bit (x86-64) processor architecture. The installation media is the same for all the consumer editions of Windows 7 that have the same processor architecture, with the license determing the features that are activated, and license upgrades permitting the subsequent unlocking of features without re-installation of the operating system. This is the first time Microsoft distributes 2 DVDs (1 DVD for IA-32 processor architecture, the other DVD for x86-64 processor architecture) for each edition of Windows 7 (Except for Starter and Home Basic). Users who wish to upgrade to an edition of Windows 7 with more features can then use Windows Anytime Upgrade to purchase the upgrade, and unlock the features of those editions. Some copies of Windows 7 have restrictions, in which it must be distributed (If not, sold or bought) and activated in the geographical region (One of the geographical regions can be either: Southeast Asia; India; or Latin America and the Caribbean) specified in its front cover box. Windows 7 includes a number of new features, such as advances in touch and handwriting recognition, support for virtual hard disks, improved performance on multi-core processors, improved boot performance, DirectAccess, and kernel improvements.