Might as well bump this to say that I've still had absolutely no luck and that I've more or less resigned myself to the fact that GBA hacking is a lost cause on this computer unless I really, really want to be limited to the vanilla music. None of the modded versions work, they just give the same goddamn vbalCbEx6.ocx error. Running it as an admin doesn't work. Installing it directly through the Helmeted Rodent installer doesn't work. Basically, if there's a solution posted on the internet that has worked for another user, I have tried it, and it didn't work. Virtual machines are probably out since my computer is a laptop.
If anyone can offer any help at all, I'd be very grateful.