Microsoft released Service Pack 1 (SP1) for Windows 7 in February 2011 , this service pack contains all accumulated updates released since Windows 7 RTM release. You need to download and run Service Pack 1 (or through Windows Updates) to update your Windows 7 to the latest Win7 SP1 after clean windows install, are you still trying to slipstream SP1 into Windows 7 installation DVD? Not required now! As you can now download Official Windows 7 integrated with SP1 ISO images directly from Digital River Servers, FYI, Digital River is Microsoft official online distributor partner.
UPDATE: Microsoft has removed the ISO files from Digital River, if you’ve a genuine license key, use it on official Microsoft Software recovery page to download them.
Downloading these ISO images from Digital River is legal and free of charge. Downloaded ISO images will be of virus and malware-free as Digital River is official Download Channel. However, you need to purchase a license key to activate Windows 7 after using it for 30 days. We’re not sure by using the command “ slmgr -rearm” you can use evaluation copy further for 120 days.
Download Windows 7 Integrated SP1 ISO Images
Windows 7 Home Premium x86 SP1 (bootable)
Windows 7 Home Premium x64 SP1 (bootable)
Windows 7 Professional x86 SP1 (bootable)
Windows 7 Professional x64 SP1 (bootable)
Windows 7 Ultimate x86 SP1 (bootable)
Windows 7 Ultimate X64 SP1 (bootable)
After downloading these images, you can burn them to DVD without any burning software from Windows 7 by right clicking on the image. [via]