This document discusses different versions of the Windows operating system for clients. It provides brief overviews of Windows XP, Windows 7, Windows 8 and 8.1, and the beta version of Windows 10. It notes that Windows XP is no longer supported by Microsoft and unsafe to use. Windows 7 requires at least 2GB of RAM and has better security than XP. Windows 8 added touch compatibility but removed the start menu. The document recommends not upgrading an operating system unless the client wants to generate more business for a computer technician, as older hardware may not be compatible with newer versions and cause slow performance.