Windows XP is not available for download from Microsoft, so surely it is not free. You should buy a copy from local or on-line retailer.

There are many places were unlawfully Windows XP can be downloading and possibly many other software packages. This means stealing software like that you go into retail store and came with a boxed product hidden under your coat.

Now there is one extra complication if you unlawfully download an image of a Windows XP installation CD. That image does not contain product activation code or "product key". The product key is printed on the box which you did not buy. You can’t install Windows XP without product key. The right thing is go and buy a copy of Windows XP.