If you like the xp 64, I would duel boot with 32 bit also. Mine can not use some of my burning software for my dvd. So,I duel boot between xp x64 and the xp x86(32 bit). If you like Vista then go with the premium x64 or the Ultimate x64. But check first if your mp3 web site have the drivers for vista also. If you can wait till next year, I would get the Windows 7 x64. Like that a lot better than Vista by far.