Estimates consistently place Windows Vista system requirements on the high side. Potentially, the new OS may require a 2GHz or better processor, 512MB RAM, a 256MB video card (to power the Glass interface) and a SATA hard drive just to provide minimal performance, but you need not spend $1,000 or more for such a PC. Build a barebones box capable of running Vista and Glass for less than $500. This gallery shows you how!