Namaiki, yes it will eventually freeze using ffdshow. I even tried Windows Media Player with its DVD-DTV Codec, or whatever it is called, and caused the same error. Incidentally, the files I have been having trouble with have not been calling on DXVA. The latest is the 1080 version of Utawarerumono by Thora which does not use DXVA and another was a Coal Girl's release of Tatuyama: Kiss On my Deity which was 1080 but did not use DXVA.
Again, thanks to all who provided feedback. I stopped banging my head on the wall trying to fix a software or driver problem because you people made me think I might have a genuine hardware problem. I called Dell technical support and after I described the history of my problem and what I had already tried, they decided to replace the whole motherboard with attached video card without even trying anything else. I hope that fixes the problem.