The first usable verion of Windows is Windows 3.1
Windows is an "Operating System" not a program. And Windows 95 wasn't the first, there were earlier versions of windows and DOS, the first one called Microsoft Windows 1.0, and was released in 1985. Windows NT 3.1 was the first NT version of Windows (which all of the recent and upcoming versions are based on)
Windows 2000 was the first
No, Windows Internal test release 3 was the first ever one
Start with windows 2000 then windows xp.
The first version was available for Windows Me in 2000.
Windows 2000
Windows for Workgroups
Windows NT 3.1 was the first to use a preemptive multitasking. However, it was Windows 95 which had true multitasking.
The first version of Windows, Windows 1.0, was introuced in 1983, but was not actaully releasec until 1985.
Windows 1.0 was introduced in 1985.
windows 2.0