Windows 7 32bit & 64 bit Direct link

Minimum System Requirements for Windows 7

• 1 GHz or faster 32-bit (x86) or 64-bit (x64) processor
• 1 GB of RAM or 2 GB of RAM for the 64-bit version
• 16 GB of available hard disk space or 20 GB for the 64-bit version
• DirectX 9 graphics device with WDDM 1.0 or higher driver.

Download Links Here                      

You can download 'Windows7Ultimate' from given links for free.

•  Windows 7 32bit
•  Windows 7 64bit 

Recommended:  Use Internet Download Manager for high speed and resumable downloads.