my serialnummer do not work

Do you get an error message?  See if any of the following look familiar...

Error "The serial number is not valid for this product" | Creative Suite

http://helpx.adobe.com/creative-suite/kb/error-serial-number-valid-product.html

Error unable to validate serial number | CS6

http://helpx.adobe.com/creative-suite/kb/unable-validate-serial-number-ccm.html

Error "This serial number is not for a qualifying product" | CS6, CS5.5, CS5

http://helpx.adobe.com/creative-suite/kb/error-serial-number-qualifying-product.html

Redemption Code Help

http://helpx.adobe.com/x-productkb/global/redemption-code-help.html