MS Version 5.1 A client version of Windows that was widely used. Adding more security and administrative capabilities, XP became available in 64-bit versions for AMD x86 and Intel Itanium CPUs.
XP Mode is free for users of Windows 7 Pro, Enterprise and Ultimate. Users of 64-bit Vista, 64-bit Windows 7 Home versions and 64-bit Windows 8 may employ VMware, Virtual PC (free) or any other ...