How to got windows 7 key?

If your Windows product key isn't valid, if you don't have a Windows product key, or if you've lost the product key that came with Windows, you'll need to buy a new one to activate Windows.

To obtain a new genuine Windows 7 product key, you'll need to buy an additional copy of the same edition of Windows 7, which contains a product key that you can use. For more information about how to get Windows 7 in your country or region, go to the Shop webpage. You can also purchase Windows 7 at retail locations.

See this photo to got windows key here:  http://goo.gl/IfsOO6

Windows 7 Ultimate key: 236TW-X778T-8MV9F-937GT-QVKBB
87VT2-FY2XW-F7K39-W3T8R-XMFGF 
Windows 7 Professional key: HWRFF-2FFYX-XFXP2-DYFC3-BX3B7
YT9K9-4R938-3TVXX-3Q3QT-9HBXM 
Windows 7 Home Premium: P4DBR-8YPT6-KHRB8-6T7RW-GMXGV
  FGTCF-8JBG2-4BK4G-36JWB-PFQXB 
Windows 7 Ultimate Sp1:   RHTBY-VWY6D-QJRJ9-JGQ3X-Q2289