Windows 7 starter edition is only available in 32 bit format.. I don't think its the processor (nehalem in this case) not supporting it.. It may rather be the board manufacturers who do not give support (drivers basically).. The starter edition was built for OEM's so may be it runs on restricted hardware with custom made drivers.. Further deductions may be that the X86-64 architecture, on which most of the current generation processors are based on, may not be recognized by the installer..