Finally, Windows 7 has got a official service pack from Microsoft in the form of Windows 7 Service Pack 1 RC (Release Candidate). Before that there have been leaked versions of service pack available on the web over the Torrents site. Today its official and now you can Download Windows 7, Windows Server 2008 R2 Service Pack 1 RC (KB976932) directly from Microsoft.
Windows 7 and Windows Server 2008 R2 SP1 Release Candidate helps keep your PCs and servers on the latest support level, provides ongoing improvements to the Windows Operating System (OS), by including previous updates delivered over Windows Update as well as continuing incremental updates to the Windows 7 and Windows Server 2008 R2 platforms based on customer and partner feedback, and is easy for organizations to deploy a single set of updates.
As shown in the screen-shot, download the appropriate setup file windows6.1-KB976932 based on your operating system whether its 32 bit or 64 bit. If you want the to install Windows 7 SP1 RC through your Windows automatic update Feature, you should download and install other file WUSignUpTool as shown in the screen-shot.