From my HD. I can't remember where I downloaded it originally, I just picked it from my wallpaper "archive". When I found it I was probably googling for "dual monitor wallpapers" or something similar.
Oh, I see. In effect I haven't thought that. But after years of XP, when I used Vista a bit (on my notebook) I was VERY disappointed. Now on my desktop PC I have installed Seven: it's in another universe, that's sure. Almost NO crash at all, and it's still a beta. And my God it's fast. I'm sure I'll buy it when it comes out (this year? next year? whatever...)