Genesis plus GX won't usb

Hello all. So two things...
1. Genesis plus GX doesn't even find my sega roms on my Hard Drive, only the few that are on my SDcard. (And I DID click l"load from USB)
Short of putting all the roms on my SDcard, Is there an easy solution?2. I went to play a back-up of NSMB Wii, and it didn't have my save files. So I loaded my actual copy onto the drive, played THAT copy and the save files worked. THEN, about ten minutes in, it will stop the game and has an official nintendo error page come up that says to refer to the manual. I googled for an hour and got no luck.
Does having two back ups of the same game screw things up? or do I have a bug on my hands?Thanks guys (and/or girls).

You need a better emulator.I have a huge list of emulators for the Wii here - http://forum.romulation.net/index.php?topic=35411The best Genesis emu for the Wii is http://wiibrew.org/wiki/Genesis_Plus.
It has run every game for me without fail and without any errors.

Wait, is that the same as genesis plus gx or different?

Replying to #3

It's different.