DivX Networks has released an update of DivX (DivX 5.2.1) released, which fixes problems involved in the use of DivX aufterten, if on your system, Service Pack 2 of Windows XP is installed. The problems may occur if the new XP feature "Data Execution Prevention is enabled and they have expressed is that the DivX (Pro) codec is not in the list of available codecs arises. As a problem-solving can either disable this feature (which is not necessarily advisable, since it is the increased system security is used by windows) or simply the new version of DivX installed.
more infos at bei www.divx.com