If you still haven’t installed Windows 7 Service Pack 1 (SP1) Microsoft is ready to do it for you. The company has announced its plans to begin an automatic rollout of the service-pack starting tomorrow.
 
Microsoft stated that the auto-install is part of their “ongoing effort to ensure continued support and improved security updates for customers who have not yet installed SP1”. Users have had the choice to install the service-pack up until now, starting tomorrow “the installation will be fully automatic with no user action required for those who already have Automatic Update enabled” according to Microsoft.
 
It won’t be immediate for all users, SP1 will be “released gradually over the coming weeks to all customers on the RTM version of Windows 7” says Microsoft, who also warns that “the service pack will take slightly longer to install compared to other updates”. Customers are encouraged to “check for sufficient free disk space” and make sure their “AC power is present on a laptop”.
 
Microsoft also states that the update only applies to “Windows 7 consumer PCs that are not managed by a Microsoft management tool such as Systems Center Configuration Manager (SCCM) or WSUS Server”. If you are a SCCM or WSUS administrators you will not be auto-updated
 
more info: microsoft