Product key and installed program do not match windows 7 Home premium

I bought a new Dell laptop and it came with windows 7 home premium installed and a diskette of drivers and every time I wonder to record the product key it tells me that it is not the key.  I'm going by what is on the label, and I think that I don't have to buy another key product or program windows 7 because I have both and the older two of 10 months.  Now my computer tells me I have windows which is not authentic and my screen is black. What should I do?

On laptops from Dell, you find the product key in the compartment to batteries.

Click Start, right click computer

Click on properties

Scroll down to the Windows Activation

Click on the link change product key

Enter the product key located on the COA sticker at the bottom of the laptop and click next to activate via the Internet.

COA certificate of authenticity:

http://www.Microsoft.com/howtotell/content.aspx?PG=COA

??

What is the certificate of authenticity for Windows?

http://Windows.Microsoft.com/en-us/Windows7/what-is-the-Windows-certificate-of-authenticity

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