Mostly, the need, the cash, and the upgrade package. A system that can run
XP Home should be able to run XP Pro. The question is whether you need the
upgrade (and there are reasons to, particularly if you require more complex
networking or encryption). It's a very simple upgrade.
There is no special upgrade version just for this, but the
regular XP Professional Upgrade works fine (although it doesn't
say so on the box).
But are you sure you want to do this? Are you aware that XP Home
and Professional are identical except that Professional includes
a few features (mostly related to security and networking)
missing from Home? Most home users don't need and would never use
these extra features and will see no benefits by upgrading.
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