Why does my Serial Number register as invalid?

Can someone please tell me why my Serial Number keeps coming up as invalid when I try to register my Photoshop CS4 Extended which I purchased new from a store.

Hi Dobe29,
Welcome to Adobe Forum,
Please refer to the steps in http://helpx.adobe.com/creative-suite/kb/invalid-serial-number-cs4.html
For the best assistance, I recommend our chat support at http://adobe.ly/yxj0t6.
You can try this, it might help you.
After installation ,Just delete this file C:\Program Files\Common Files\Adobe\Adobe PCD\cache\cache.db This is the location where it installed the serial . After deleteing it will create a new cache.db file and store the serial there that goes with that disk . When you open PS cs4 it will ask to enter serial again.Just enter the serial again that came with box
Regards,
Rajshree

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    Hello,
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    Hi Dobe29,
    Welcome to Adobe Forum,
    Please refer to the steps in http://helpx.adobe.com/creative-suite/kb/invalid-serial-number-cs4.html
    For the best assistance, I recommend our chat support at http://adobe.ly/yxj0t6.
    You can try this, it might help you.
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    Regards,
    Rajshree

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