I lost roms to a virus and started back out with 103 and the rerst were pre merged packs ex( 103 to 103u4 merged roms) So I couldnt figure this clrmame out. I never had a problem running software but I just dont get this even after reading the somewhat of a tutorial. So I copied and pasted the roms into the rom folder containing 103. My question is did I mess them up doing this? Can I just copy and paste them into my rom folder and overwrite if 2 same exist?