Product key doesnt work for microsoft office home 2007

I got a working office key from: http://www.cdekey.com/. The key is genuine and it cost me a little money.

If you cannot find your product key or it does not work, you can obtain a new one. To obtain a new product key, contact Support. Find the Support telephone number for your area by running the Product Activation Wizard on your computer.

When you contact Microsoft for a new Office product key, please have the following items available for the customer service representative:

• The product CD-ROM.
• The computer on which you want to install Office.
• The readable parts of your original product key (if available).
• The ProductID information in the registry (for advanced users only).

To run the Wizard...follow these instructions. You'll find the phone numbers there.
Activation Wizard 2007 Microsoft Office loadTOCNode(3, 'moreinformation');

1. Click Start.
2. Point to All Programs.
3. Point to Microsoft Office.
4. Click any Office program.
5. After the Office program starts, click the Office button.
6. Click program_name Options. (For example, click Word Options or Excel Options.)
7. Click Resources.
8. On the activate Microsoft Office line, click Activate.