if you manually moved the files over, then try manually registering them from a command prompt inside the syswow64 directory.
I think that was the final step I had to do in order to get it to work.
I know me, Frizzle, and Headkaze at least have it working in XP64, we should be able to get yours going as well.
Edit: Just reviewed my old PM's, the final step I had to do was manually move all the files that mamewah log was saying it was missing into the c:\windows\syswow64 directory, and then manually register them using regsvr32 from a command prompt inside the syswow64 directory. Hope that helps.