I may be wrong(correct me if I am, guybird), but, you should still have an E: Drive, that is only a few gigs correct? It may be just xmugen is having a funny time with the way that the hard drive is portioned, trying to play. I had this problem myself last night, when I attempted to play my pack on the usual F: drive, a couple months after I upgraded to a 500, and partitioned it. It wouldn't play, I tried everything, a different dash, unleashx, before FTPing the E:\ drive and trying that, and it worked, so that is what the new upload is based on, wherever you found xtreme xmugen, is where dc vs marvel is at...(I can only imagine)