Windows XP/Vista/7/8/10 natively support Win9x software, but Win9x games may crash or have video issues. Unix-like operating systems ( Linux, Mac OS X) can run many Win9x programs using a native implementation of the Windows API called Wine. If you want to run a real copy of Windows, but don't already own one, there is a free Windows-compatible operating system called ReactOS, which can be found in the operating systems section. Any computer running DOS ( MS-DOS/PC-DOS/DR-DOS/FreeDOS) or Windows 1.0 through Windows 3.11 that meets the minimum hardware requirements should be able to install a copy of Windows 95/98/Me.
Windows 9x operating systems include a copy of DOS and run most Win16 programs, so Win9x is a replacement for those operating systems. How this is accomplished depends on what operating system your computer is running.
Win9x software can be run on any x86 computer, as well as many non-x86 platforms.
