For the past few months, I've been encountering the COM Surrogate Has Stopped Working Error in Windows Vista, as described here. Unfortunately, most of the recommended fixes on this page didn't work for me. (I had neither DivX nor Nero installed, etc.) Eventually, I had to download InstalledCodec and use trial and error disabling of all the codecs in my system to trace the problem. I narrowed it down to the Xvid Codec and ended up having to disable it.