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[Carling]

Learn that windows is NOT the only computer operating system in the world

These DON"T get Viruses
Zorin Os works just like windows Xp, windows 7 or the Mac OS/x desktops You can change to what ever desktop you like best at the click of the mouse button, all the software you'll ever need comes with it. You can check it out here
http://zorin-os.com

There are over 100 free Free up to date operating systems available to you. here are some more that you can take a look at. all these will run on a old Xp computer.
http://sparkylinux.org/download
http://kubuntu.org
http://lubuntu.org
http://lxle.net/
http://sabayon.org/
http://tanglu.org/
http://pclinuxos.com/

Now you know there are other operating systems the rest is up to you to check them out