I'm having some major trouble with this too. I deleted the folder from Program Files, but I can't find the link to remove the registry settings on the FL site's FAQ. This is totally screwing up an unrelated program (Microsoft 3D Movie Maker), or at least I'm assuming that's what's doing it, as the FL demo is the only thing I've installed in the past few days, which is how long 3DMM has been screwed up for. Does anybody have a copy of the .reg file or have any other suggestions?
Thanks in advance.