As Purple Goat said get clrmame it checks your roms against a DAT file taylored for a specific emulator and if your rom matches your good
grab clrmame from http://www.clrmame.com/ and the DAT file you need is included within the mamegp2x zip archive.
as for if your roms are wrong you either need to redump them from your original arcade machines or do some intelligent googling as im sure others might have what your after
I fear if i say anymore ill get banned so google away
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