hey i enter my code but not work

Mac or Windows, and EXACTLY which version of the operating system?

Recent Mac AND Windows operating systems have been known to cause "odd" problems

Also, what are you installing... program name AND exact version number?

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

-http://helpx.adobe.com/creative-suite/kb/invalid-serial-number-cs4.html

-and http://forums.adobe.com/thread/1038761