"a computer preinstalled with an OEM version of XP Home might not upgrade using a retail version of XP Pro upgrade. This is especially true of laptop computers that have a customized OEM version of XP Home installed. In that case, only a clean install will work. Laptop computers require specialized hardware drivers not found in the conventional "retail, upgrade" version of Windows XP."
Upgrade from XP Home to XP Pro
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XP Home to Pro Upgrade
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How bad is upgrade from XP home to XP pro?
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307229 - Icons, Favorites, E-Mail Messages, and Customization Is Missing After Upgrade to Windows
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