Can I download Windows 2000 or do i have to buy it?

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Completely confused and lost re-computers,, etc but does anyone know if I can download windows 2000 for free or do i have to buy it?

Windows (but not Office) usually comes pre-installed on most PCs, but you usually get back up discs in case your computer crashes and you have to start from scratch. If that is what has happened, then you need the back up disks. If you haven't got them, see if you can scrounge them from someone else. If not, then you will have to buy a Windows package, which will probably include Office, but I think that only the latest version (XP or Vista) is on sale. It's usually cheaper if you can demonstrate that it is for school/student use. Have a look at the Microsoft website. You can download time limited trial packages from there.