Due to changes to the Microsoft Windows Update infrastructure, Windows 7 SP1 systems currently shipping will not update. The Windows Update client appears to run forever. To correct the issue, you need to install the following updates (below are the links for the x64 bit version of Windows 7 only). Prior to running *each* update, run the following command from an elevated command prompt to stop the Windows Update Service: net stop wuauserv. Reboot when prompted after running an update and repeat stopping the Windows Update Service before installing the next update:
After installing those updates, install the latest “roll-up” update and then try running the Windows Update client again.