Windows 7 is a personal computer operating system that was produced by Microsoft as part of the Windows NT family of operating systems.

Windows 7 ULTIMATE SP1 (32bit)
Windows 7 ULTIMATE SP1 (64bit)
Windows 7 ULTIMATE N SP1 (32bit)
Windows 7 ULTIMATE N SP1 (64bit)
Windows 7 ENTERPRISE SP1 (32bit)
Windows 7 ENTERPRISE SP1 (64bit)
Windows 7 HOME PREMIUM SP1 (32bit)
Windows 7 HOME PREMIUM SP1 (64bit)
Windows 7 HOME PREMIUM N SP1 (32bit)
Windows 7 HOME PREMIUM N SP1 (64bit)
Windows 7 HOME BASIC SP1 (32bit)
Windows 7 HOME BASIC SP1 (64bit)
Windows 7 HOME BASIC N SP1 (32bit)
Windows 7 HOME BASIC N SP1 (64bit)
Windows 7 PROFESSIONAL SP1 (32bit)
Windows 7 PROFESSIONAL SP1 (64bit)
Windows 7 PROFESSIONAL N SP1 (32bit)
Windows 7 PROFESSIONAL N SP1 (64bit)
Windows 7 STARTER SP1 (32bit)
Windows 7 STARTER N SP1 (32bit)

http://microsoft.com