Fault protection error on Roms???

Archived from groups: alt.games.mame (More info?)

i am running Omnicade(dos and Mame .87 i believe) and on a few different
classic games for instance, Ms Pac/Frogger/Space Invaders(.90 roms), but
these certain games will give me an error while playing it and revert back
to front end! all other games haven't been a problem. it comes up pretty
fast horiz/sideways on the monitor(vert mounted) right after i start game
usually, so it's quite hard to read exactly what is says and it doesn't
happen every game or all the time. it's just intermittent on those games it
seems.

all i can get out of it is something about "fault
proctection....error...........", but it's about 4 or 5 lines long.

any ideas what this could be? i have changed out the RAM thinking that was
it but still does it!
bad sectors on HDD maybe??? rom version maybe???

TIA
Kelly