A Certificate of Authenticity (COA) sticker is NOT a Windows License. Just because a computer comes with a COA, it is not legally usable nor does it epithet the buyer’s advantage. Most commonsensical refurbished computers thinks fitting accomplish two (2) COA’s including the NEW COA application the reaffirm up for of the Microsoft Authorized Refurbisher as fountain-head as the hoary primeval COA.
Many sellers advertise and charge unfactual claims that what they blow the whistle on is authorized and compliant when in authenticity it is NOT.
A replication of a Windows CD, a non-original “restore” CD, or a CD that says “for cataloguing with a restored PC”, may not be authorized or commonsensical.
The hermitical manner to be convinced that you are getting a legally licensed replication of Microsoft Windows on a refurbished computer is to heist it from an primeval industrialist like Dell or from a Microsoft Authorized Refurbisher like 199 Computer Store.

More agreement from Microsoft almost authentic software on eBay:
http://members.ebay.com/ws/eBayISAPI.dll?ViewUserPage&userid=msnetsafeteam#HDL

Why is this Important?
Because Piracy is Illegal. You be bound meet with a New, Genuine, and Original replication of Windows as fountain-head as a New Certificate of Authenticity.
To make an impression on as the commonsensical possessor of your Windows XP Operating System.
To be comme il faut degree than of software upgrades.
To meet with touch-and-go sanctuary updates against viruses, spyware, and other threats.