Windows 7 Prof X64: Sp1

Cumulative updates to protect against vulnerabilities discovered after the initial 2009 launch.

Allows the computer to connect to a corporate or school network (Windows Server Domain). Sp1 Windows 7 Prof X64

Enhanced reliability when printing mixed-orientation XPS documents. System Requirements (x64) Processor: 1 GHz or faster 64-bit (x64) CPU. RAM: 2 GB minimum. Hard Disk Space: 20 GB available space. System Requirements (x64) Processor: 1 GHz or faster

Windows 7 Professional with Service Pack 1 (SP1) 64-bit is a version of the Windows operating system that includes the original OS features along with a significant collection of updates, security patches, and performance improvements released through February 2011. Core Features of Windows 7 Professional Windows 7 Professional with Service Pack 1 (SP1)

Enables you to connect to the computer from another machine remotely.

Automatically identifies the correct printer when moving between home and office networks.