I have acrobat XI and a working SN, I want to move to a new windows machine. How do I do it?

Question

I've downloaded a new Acrobat XI to the new machine.
The validating screens indicate that SN is valid.
In fact it is on the same machine. All I have done is replace the
hard drive.
The validation dialog requests an SN from prior versions which
I also have. None of the products listed are ones that I have had.
Finally, I have the original email from Adobe registration/receipt and download
directions which included my XI serial number. The directions
have worked in the past. They don't work now.
What is going on?
-m

Answer 1

Rave,
       Thanks for the suggestion, but it did not solve the problem. The following describes in detail what I did.
I followed this basic approach in a chat session. I can see several opportunities for error, which I have suggested. Further thoughts?  I'll try Ravinder's suggestion next.
Details:
- Restarted machine.
- Started ACrobat XI Pro
.... Acrobat XI Pro window appears that is titled: Serial Number Upgrade
....... message: "Serial Number you provided is valid, but a qualifying product
                  could not be found on this computer"
....... There is a "Select a product" option with window marked Serial Number
        next to it.
....... You suggested that I select "Acrobat 10 Pro" and the corresponding serial
        number from my account page. The Acrobat 10 selections are:
           1. Adobe Acrobat X Pro Macintosh
           2. Adobe Acrobat X Pro Windows
           3. Adobe Acrobat X Suite
        There is no exact match with what you suggest, though item 2 looks most
        likely.
....... Observation: My account page indicates 4 Acrobat products, three titled
        Adobe Acrobat (9,10), one titled Adobe "Acrobat Professional 11"
        My account product list does not obvioulsy include your suggestion,
        or the possible selection offered in the window.
        Though again item 2 looks most promising.
- Selecting "Adobe Acrobat X Pro Windows"
- Pasting in the serial number from my account listed for Adobe Acrobat 10.
- I see that the selection window has returned to "Select a product". I don't think
  I noticed that before. I certainly expected to select the product and then provide
  the SN.
- Reselecting "Adobe Acrobat X Pro Windows"
- The message does not change. It still says:
....... message: "Serial Number you provided is valid, but a qualifying product
                  could not be found on this computer"
  However, the Next button has changed state suggesting that it may be clickable
- Clicking on Next.
- The Message changes and now reads:
....... message: "The serial number you provided is not for a qualifying product,
                  Please try another"