Finding out which operating system you use is simple. If you have an Apple Macintosh, you use Mac OS; if you have a PC, you use Windows.

If you have a PC, you have Windows 3.x, Windows 95, Windows 98, Windows NT, Windows 2000, Windows ME, or Windows XP. Any one of these will tell you what version it is when you start up your computer. A screen will appear that will say "Windows X" where 'X' is your version. If you have a "Start" button in the bottom left hand corner, you can see your version by clicking on it. In most cases, it will say "Windows X" along the left side on a blue bar where 'X' is your version. If it does not, click on
"Run", type "winver" in the text field, and press enter. If you do not have a "Start" button at all, you have Windows 3.x.

If you have an Apple Macintosh and need to know what version of the Mac OS you are running, click on the "apple" in the top right hand corner of the screen and choose "About This Mac" (this item may also be called 'About This Computer'). It will then give you information about the computer, including the version of your operating system.