Windows 7 Service Pack 1 (SP1), or KB976932, is believed to have been pre-released to OEM manufacturers and I'm feeling honored to share with you that what is cautiously advised to be the final version. They also confirm, with some accuracy, that this may be the the final, official, digitally signed version of Windows 7 Service Pack 1 which has been scheduled for imminent release to manufacturers (RTM), but has not yet appeared on Windows Update. This download also includes Windows Server 2008 R2 Service Pack 1.
Windows 7 Service Pack 1 (SP1), or KB976932 will available to users according to below criteria:

Official Public Availability: February 22, 2011
TechNet/MSDN/Volume: February 16, 2011


Windows 7 Service Pack 1 (SP1) 32-bit
Filename: windows6.1-KB976932-X86.exe
Filesize: 563,934,504 bytes
File Verification:
MD5 Checksum: 4bf28fc00d86c936c89e2d91ef46758b
SHA-1: C3516BC5C9E69FEE6D9AC4F981F5B95977A8A2FA
CRC: 5EB0FA87
Build Version: 7601.17514.101119-1850
Release Version: 7601.17514.win7sp1_rtm.101119-1850
Digitally Signed by Microsoft Corporation

Download the 32-bit Version from Content Delivery Network
Download the 32-bit Version as a Torrent (Requires a Peer to Peer Networking Client)
Download the 32-bit Version from Chicago, Illinois (Not Recommended)

Note:Download all above version from the below provided page link of Windows7forums 

http://windows7forums.com/windows-7-discussion/56605-windows-7-service-pack-1-sp1-download-available.html

Windows Server 2008 R2 Service Pack 1 (SP1)64-bit
Filename: windows6.1-KB976932-X64.exe
Filesize: 947,070,088 bytes
File Verification:
MD5 Checksum: 28d3932f714bf71d78e75d36aa2e0fb8
SHA-1: 74865EF2562006E51D7F9333B4A8D45B7A749DAB
CRC: 068C79C6
Build Version: 7601.17514.101119-1cdn850
Release Version: 7601.17514.win7sp1_rtm.101119-1850
Digitally Signed by Microsoft Corporation

Download the 64-bit Version from Content Delivery Network
Download the 64-bit Version as a Torrent (Requires a Peer to Peer Networking Client)
Download the 64-bit Version from Chicago, Illinois (Not Recommended)

Note:Download all above version from the below provided page link of Windows7forums

http://windows7forums.com/windows-7-discussion/56605-windows-7-service-pack-1-sp1-download-available.html

Source And Credits: WIndows7forums