Already download and install Windows 7 Pre-Beta build 6801? You probably have to leave the product key field blank during installation in order to complete the setup of Windows 7. However, without proper activation, Windows 7, although it’s only an alpha release, can only be used for 30 days maximum (probably can use for up to 120 days as similar with activation free period of Vista with 3 rearms available - see how to rearm for more details).

People who is more nostalgia and loves to keep old things may have hit a jackpot lottery in the case of Windows 7 pre-beta activation. For Windows enthusiasts who still remembers, back in 2006, Microsoft launched Windows Vista Customer Preview Program (CPP) that gave out free beta (including beta 2) and RC (for RC1 and RC2) product key to users who participated. The Windows Vista Beta or RC1 product key arrived in the email that looked similar to this:

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