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To see which Operating System you have take a look at the bottom left of your computer screen. If you see a button that looks like this:
then you have Windows XP. The tutorials for your Operating System are here:
If, however, you see a round button like this one:
then you have either Windows Vista or Windows 7. To check which you have (Vista or Windows 7) click the round button once with your left mouse button. You'll see a menu appear:
From the menu, click on Control Panel on the right-hand side. You'll then see a new screen appear. From this new screen, click on System and Security:
When you click on System and Security, you'll be taken to a new screen:
Click on System to see the following screen:
As you can see, the computer above is running Windows 7 Home Premium.
In any case, both Windows 7 and Vista tutorials are here:
But you should now know which Operating System you have.