the only emulator tha freezes is the meka-x v3, i select any rom then gos to config screen, when i press B insted load the game, the emulator freezes... what i have to do? My dashboar is the XBMC with 160gb HD

When I first released that I forgot to include some needed "system" files. So you need to acquire a download that has those missing files. You should be able to get what you need at the usual places or where I hangout.