The release of Windows Vista, the latest Microsoft operating system, is an opportunity for engineers and scientists to harness new technologies and features to solve technical problems. Unlike previous versions of Windows, there are two widely available versions of the new Windows operating system: Windows Vista for 32-bit processors and Windows Vista x64 Edition for 64-bit processors. Whether porting a system to Windows Vista or starting new development on the OS, it is important to understand which version best suits your needs.