Windows 7 Tip: 
Microsoft servers surrender to the massive traffic that hits the Windows 7 Beta CPP page. And if you are also trying to download the Windows 7 Beta form there and can,t get the download link. Than here are the Windows 7 Beta Download Links, which will help you to download the Windows 7 Beta.
Here are the Links:
ISO for Windows 7 Beta 32-bit (English):
7000.0.081212-1400_client_en-us_Ultimate-GB1CULFRE_EN_DVD.iso
ISO for Windows 7 Beta 64-bit (English):
7000.0.081212-1400_client_en-us_Ultimate-GB1CULXFRE_EN_DVD.ISO
ISO for Windows 7 Beta 32-bit (German):
/7000.0.081212-1400_client_de-de_Ultimate-GB1CULFRE_DE_DVD.iso
ISO for Windows 7 Beta 64-bit (German):
7000.0.081212-1400_client_de-de_Ultimate-GB1CULXFRE_DE_DVD.iso
And to get the Product key go to this page
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