I've searched here on the forum but can't quite nail down whether or not I can get away with buying just the Upgrade XP Pro package instead of the full package. The machine I'm wanting to put it on is currently running Win98...and I have the OEM (Dell) "resource" disk...but it only has one hard disk in it at the moment. I may have been dreaming, but it seems I read that in order to do a clean install with the upgrade package, one needs to have at least two hard disks in the machine? Is this true?