Intel Pentium III or equivalent (1.3 GHz or faster recommended).
Windows XP, released in 2001, was a significant operating system update from Microsoft. It combined the stability of the Windows NT kernel with the user-friendly interface of Windows 98 and ME. Windows XP introduced a redesigned interface, improved performance, and new features like the Start menu, Taskbar, and Notification Area.
At least 128MB (512MB recommended for better performance).
Internet Explorer 6.0 or 7.0 for basic integration. How to Download and Install
However, there is a catch: The official Adobe Updater will try to push you to the newest version (which won't work) or demand you upgrade to SP3.