Whats the difference??

That's an upgrade. Meaning you'd have to have XP already installed on it to use that.
Rubbish, you can clean install from an upgrade disk, just don't put in the keycode the first time then reinstall it, it sees the "no keycode install" as the previous version, you should do this anyway, never actually use an upgrade disk the way it is supposed to be used.

Don't all Vista disks have both??

:confused:
 
Oh, I suppose that would work, haha.

OEM Vista disks are one or the other. Retail Vista disks are both 32 and 64 bit.
 
Rubbish, you can clean install from an upgrade disk, just don't put in the keycode the first time then reinstall it, it sees the "no keycode install" as the previous version, you should do this anyway, never actually use an upgrade disk the way it is supposed to be used.

Vista REQUIRES XP to already be installed, period.
 
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