The Windows 7 product keys given away by Microsoft to Windows 7 Release Candidate (RC) downloaders appear to be from a pool of same 15 sets of product keys, similar to what’s happen during public availability of Windows 7 Beta where everybody gets the same sets of Windows 7 Beta product keys, after massive interest crashed the Microsoft servers.
After downloading and installing the 32-bit and 64-bit Windows 7 RC x86 and x64 DVD ISO images, the default activation grace period of 30 days applies. For users who want to use the Windows 7 RC systems beyond 30 days activation period, use one of the following free product keys to activate the Windows 7 system.
Free Windows 7 RC Activation Product Keys
The product keys can be used to activate both 32bit and 64bit Windows 7 RC.