For those that wish to get the full version of SiN running, you can install the LIFLG demo installer and copy its launch script and compat libraries to a second installed copy of the retail copy. Then simply change the launch script to look for "sin.exe" rather "sin-demo.x86".
It runs and seems to be all right, except for the sound which as doctoren has already commented only seems to work in the introductory videos. I tried the same thing that I did to the demo to get sounds, which still does work with the demo, but it does not seem to work with the retail game, at least the way I have it set up.
