You'll need to purchase a "Retail Upgrade Version" of
Windows XP Professional in order to upgrade over an
existing Windows 2000 installation. OEM versions of
Windows XP must be installed on reformatted drive
partition.
--
Carey Frisch
Microsoft MVP
Windows XP - Shell/User
That's right. OEM disks are intended to be installed on new systems -
or at least onto a disk that does not already have an OS on it. OEM
disks will not upgrade existing systems.
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