Why can I not use my old genuine copy of windows Vista on my new pc?

Windows vista on new pc

Why can I not use my old genuine copy of windows vista on my new pc?
I received an activation message and I don't know what to do

If your Vista came pre-installed in your old PC, then this is an OEM license that cannot be transferred to your new PC.

To analyze and solve problems for Activation and Validation, we need to see a full copy of the report produced by the MGADiag (download and save to the desktop - http://go.microsoft.com/fwlink/?linkid=52012 ) tool
Once saved, run the tool.
Click on the button continue, which will produce the report.
To copy the report in your response, click the button copy in the tool (ignore the error at this stage), and then paste (using r-click and paste or Ctrl + V) in your response.
-* in your own thread *, please

Please also state the Version and edition of Windows cited on your COA sticker (if you have one) on the case with your machine, but do NOT quote the key on the sticker!
 http://www.Microsoft.com/howtotell/content.aspx?PG=COA

Tags: Windows

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