Cumulative updates to protect against vulnerabilities discovered after the initial 2009 launch.
Service Pack 1 was primarily a roll-up of previously released security and stability updates. Key additions included: Sp1 Windows 7 Prof X64
Fixed issues where audio devices would disconnect after a restart. Sp1 Windows 7 Prof X64
Automatically identifies the correct printer when moving between home and office networks. Sp1 Windows 7 Prof X64