Hello all. This is my first post so sorry if I sound like a total fool, and this might be a silly question, but please don't say 'Yes' or 'No', because I'm looking for a detailed answer so I can understand how it all works. Basically I see so many different releases by these various underground groups and when I try them to replace my orginal copy (that keeps getting out dated every day.) I always seem to see a difference. My question is; Are all XP builds the same? Can I download any old version to replace my outdated disk? Is it safe to do so? With SP3 released, can I download any old SP3 and will it be exactly like a retail SP3 on the store? P.S. I'm not sure if this illegal, but I'm not skipping any paths here by downloading an updated OS and using my own key. thanks.