Okay,um could you please be a little more specific as to what emulator your using and the game(s) your trying to play.
EDIT:Whoops! Did'nt know this is in the M.A.M.E. GP Fourm. I just clicked the link that was on the main page,but I did'nt see that this is posted in the MAME fourm. Newbish mistake hopfully won't happen again.