Why do I get the error "Wrong Product ID" when I try to register the MPEG...

Why do I get the error "Wrong Product ID" when I try to register the MPEG plug-in in Vegas Video? When you attempt to render a project as an MPEG file and choose MPEG from the Save as type drop-down list, Vegas prompts you to register the MPEG plug-in. When you attempt to register, you get an error saying "Wrong Product ID" and you cannot render to MPEG format.

On November 14th, 2001 Sony Media Software ended support for the Ligos MPEG plug-in that was included in the Vegas 2.0 line of products. After that date, any attempts to register the plug-in return an error stating "Wrong Product ID." A new MPEG plug-in (MainConcept MPEG plug-in) has been added to the Vegas Video 3.0 and later line of software. The MainConcept MPEG plug-in will register appropriately. Please refer to this link for further information about this change in MPEG support in Vegas. You can also contact Sony Media Software's customer service department.