I have a problem" xvidcore.dll not found " with winavi video converter

Hi when I try to convert one movie with winavi video converter v9.0 it said to me this " xvidcore.dll not found " I download xvidcore.dll and put in windows/system32 and I have the same problem, can you help me please?
thank you

You can try downloading xvid and (re?)installing it.
http://www.moviecodec.com/downloads/8d.html