how do i know that my OS xp installed on my pc-- not licenced or a licenced?

Q: what am i going to do to know it is there any difference between licenced and not licence installed (i mean peformance, features ,accessibility)

A: Just go to Microsoft/Windows Update. If it fails during installation of Genuine Validation Tool so it's pirated. There are no different between original and pirated, just only in pirated, you can't do Microsoft/Windows Update and in the right below there will be popup saying "You may be the victim of counterfeit....". You can't remove this pop up

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