As I wrote in this thread:
http://www.fileforums.com/showthread.php?t=73563
Alcohol doesn't seem to have anything to do with it, I tested it on a fresh Windows install with optical drives unplugged, no go. Same on both machines I'm using.
Seems like DT4 just isn't what most of us were waiting for...
Nevertheless: congrats to everyone who could get sf games to work without even unplugging your drives!