The biggest issue is in fact windows, when it comes to play old games. Newer versions of windows are often not compatible with games made windows 7, XP, and 95.  While you can sometimes run old versions on a modern computer, it is very difficult due to modern hardware not being compatible and not having drivers. Only other option is emulation, but so far that has proven to be difficult when it comes to pc operating systems above dos/win3.<br>Some day maybe the older operating systems can be emulated