Description

 This a simple way to make you're copy of Windows XP Pro SP2 (And SP3 as tested by steve20081976) a genuine one.  I take no credit for creating any of the files here. I merely found a great way to do this, and put it in a neat little package.

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!!!WARNING!!! Some virus scans may recognize "Magic Jelly Bean Key Finder" as a "malicious", or "unwanted" program.. I assure you it's not. If you're paranoid like our friend "yacinedima" here, then please feel free to not use the copy included and go to http://www.magicaljellybean.com/keyfinder/old.shtml and download it yourself (v1.41 works best in my opinion, that's why it's included in the download). If you were getting virus warnings you will still get them if you download it yourself. 
That's just how it is.
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"How do I do this?" you say?.. Well first of all, download the torrent....
Then follow these instructions.

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-Instructions-
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Step 1:
Run the MGADiag tool... (or as Martina1800 suggests you could also go to  http://www.microsoft.com/genuine/ and on the left side of the page click the "Validate Windows" Button)
If it comes back with "INVALID KEY" 
or something to that effect... Never fear! 
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Step 2:
Run the "Magic Jelly Bean Key Finder" ... 
then Click on the options drop down menu.. 
and select "Change Windows Key". 
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Step 3:
Locate the GenuineWorkingKey text document 
(included in this download)
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Step 4: Enter the genuine key into the boxes and click 
"Change"
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Step 5: Run the MGADiag tool again to 
confirm that your copy of Windows XP 
Professional is now "Genuine" 
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Have fun kids.