OK, I know you're all lurking out there with baited breath waiting to see how this technodrama winds up, so here it is: I uninstalled the whole thing, cleaned out the registry as best I could of any references to EZ CD and Roxio, and (this may have been the trick) dumped NTI CD Maker, which I forgot I even had installed. I reinstalled Roxio, and instead of using the newest patch (18.104.22.168), I used an older patch (22.214.171.124) that I downloaded and never installed. Bingo! Drive recognized, DCD back online, all is good. The only thing wrong is that the DCD icon is not in the tray, and I don't know how to get it back in. Moral of the story? The latest patch ain't necessarily the best.