MPEG 4 problem

usualy when i try to add an file to burn it as an movie dvd a message apears it says somthing like this “due to patent restriktions mpeg 4 decoding isn´t available buy or download nero retail package” i have downloaded and installed several plugins. please help nero is realy starting to piss me of.

Yes, but do you have also an appropriate serial number for Nero?

no “perhaps” i don`t