Windows 7 Service Pack 1 is now available or via Windows Update, and by . Windows 7 SP1 takes roughly 30 minutes to install, and you'll have to restart the computer halfway through. System requirements and detailed installation instructions can also be found .

Here are the most notable changes in SP1:

*     A bug fix for HDMI audio devices that stopped working after restarting the computer

*     Corrected behavior when printing mixed-orientation XPS documents

*     Changed behavior of the "Restore previous folders at logon" functionality so that all folders are restored to their previous position, rather than in cascading order based on the most recently active folders.