umm... df2 account?? did i miss something? the only thing that remotely resembles an account would be your df2 character save file, which is stored locally on your hard drive and has absolutely nothing to do with novaworld. maybe someone was pulling your leg?
didn't play very much DFLW and never TFD, but from what i remember novaworld accs and stuff were pretty much the same as now with BHD.
you need a cd-key to register your account, and it says that only one account can use this key (although i've never verified that ), so the theory of multiple accs is off.
and i'm pretty sure that yout DFLW acc and your BHD acc have absolutely NOTHING to do with each other, even if the have the same name.
heck, especially with the same name. id they were stored similarly, you wouldnt be allowed to create a new one with an existing name.
so my advice is that you do as chief said: open your stats in a web browser and save them to disk
ps:
better buy a new hard drive if you run out of space, this stuff is so damn cheap nowadays :d
i'm at 500gb now