The first one.
Windows 2000 was the first
Windows NT 3.1
windows 2.0
Windows XP
The first version was available for Windows Me in 2000.
The first version of Paint was introduced with the first version of Windows, Windows 1.0 released on 20 November 1985.
Windows for Workgroups
Windows 3.1
The first version of Paint was introduced with the first version of Windows, Windows 1.0 released on 20 November 1985.
Windows NT
The first version of Microsoft Windows was released on November 20, 1985. It was called Windows 1.0 and was a graphical operating environment for MS-DOS.
Windows 2000 was the first version of Windows to have a 64-bit edition. Windows 2000 was released on February 17, 2000, but the 64-bit editions were not released until August 29, 2001.