If you have a copy of Windows 7 Beta and you don't have the product key, you can simply get the product key at http://www.microsoft.com/windows/windows-7/beta-download.aspx.The Windows 7 Beta are no longer available for download but you can still get the product key in case you have forgotten or lost the product key.
Or you can use this key if you don't want to register.
Windows 7 Beta 32-bit Product Key
Product key: TQ32R-WFBDM-GFHD2-QGVMH-3P9GC
Windows 7 Beta 64-bit Product Key
Product key: D9RHV-JG8XC-C77H2-3YF6D-RYRJ9
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software