I tried deleting the software, and the registry entries about it, but that didn't work. Finally, I saved my bookmarks and completely uninstalled Mozilla. Upon reinstalling, suprnova still didn't work. I uninstalled Mozilla again, this time deleting my profile as well, then reinstalled again. Still no joy. suprnova still works fine in IE, but it's still telling me that I'm using a download manager.
It's been a couple of years since the last brainwipe, so I decided it's time. But since I needed to add some more storage anyway, I decided that rather than brainwipe the old hard drive, I'd just get a newer, larger drive, and do the install on that. So tonight I went up to Best Buy and bought a new 120 GB drive. They were also clearing out Sony 12x DVD±R-±RW drives for under $100, so I got one of those, too. Digital video r us. I'll probably do the installs on Saturday. This should be interesting.
One last thought. The new LiveJournal posting interface sucks. And for chrissakes why did they have to put the fucking "spell check" button where the "post" button used to be. Wankers. (Turns out the "Post to Journal" feature of the picture galleries doesn't work with the new interface, either. Pillocks.)