There's really no such thing as an uninstallation of an operating system. To
uninstall it you just format the drive.
Assuming that you have a retail version of Windows XP Professional, just
boot from the Windows XP CD (change the BIOS boot order if necessary to
accomplish this) and follow the prompts for a clean installation (delete the
existing partition by pressing "D" when prompted, then create a new one).
However, why do you not want to upgrade? Upgrades to Windows XP normally
work very well, and this specific upgrade--from Home to Professional--is the
easiest and most likely successful of all possible upgrades because so
little has to be changed.
One other point--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.
Also note another point, not included in any of the above: Professional
allows ten concurrent network connections, and Home only five.
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