Download Retail Windows 7 ISO from Official Website
[UPDATE: August 8th 2011] see below for newly added Windows 7 SP1 ISO
There are many ways you can obtain Windows 7. But 
perhaps the easiest and fastest way to get Windows 7 iso image file is from the official HTTP server. That is you can download the iso image file from digital river and amazon
Here is the URLs you can obtain different version of Windows 7 (note: do not have Windows Enterprise, as it is exactly the same as Windows Ultimate but under different License Volume agreement, for average consumers there are only 3 version of Windows 7 available that is Ultimate, Professional, and Home Premium)
Windows 7 Home Premium x86 ISO 32-bit
http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65732/X15-65732.iso
Windows 7 Home Premium x64 ISO 64-bit
http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65733/X15-65733.iso
Windows 7 Professional x86 ISO 32-bit
http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65804/X15-65804.iso
Windows 7 Professional x64 ISO 64-bit
http://msft-dnl.digitalrivercontent.net/msvista/pub/X15-65805/X15-65805.iso
Windows 7 Ultimate x86 ISO 32-bit
http://174.129.85.117/data/Windows7Ultimate32bit.iso
Windows 7 Ultimate x64 ISO 64-bit
http://174.129.85.117/data/Windows7Ultimate64bit.iso
[UPDATE August 8th 2011] After nearly a year of the release of Windows 7 Service Pack 1, you can now download new Windows 7 ISO images that comes with the Service Pack 1 (SP1) pre-installed. That means you don’t need to download all the windows updates for a fresh new install, this will save you many hours after your fresh install of Windows 7. It is strongly recommended to download the new ISO that comes with Service Pack 1 pre-installed if you need to install any Windows 7. As usual, the list below are all from official Microsoft retailer download links.
Windows 7 Home Premium Service Pack 1 x86 ISO 32-bit
http://msft.digitalrivercontent.net/win/X17-58996.iso
Windows 7 Home Premium Service Pack 1 x64 ISO 64-bit
http://msft.digitalrivercontent.net/win/X17-58997.iso
Windows 7 Professional Service Pack 1 x86 ISO 32-bit
http://msft.digitalrivercontent.net/win/X17-59183.iso
Windows 7 Professional Service Pack 1 x64 ISO 64-bit
http://msft.digitalrivercontent.net/win/X17-59186.iso
Windows 7 Ultimate Service Pack 1 x86 ISO 32-bit
http://msft.digitalrivercontent.net/win/X17-59463.iso
Windows 7 Ultimate Service Pack 1 x64 ISO 64-bit
http://msft.digitalrivercontent.net/win/X17-59465.iso
You will not be able to download or install Windows 7 Starter, the only way to obtain is through OEM netbooks.


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