Firstly, you don't unzip mame roms. You leave them zipped in the rom folder.
Next are you using Mame32 or commandline mame?. mame points to its rom folder by default so I'm presuming you are using commandline mame and you haven't generated a mame.ini
If its mame32 once you have zipped your roms back up you need to click 'file' then 'audit all'.
If you are using commandline mame you need to create a mame.ini:
First open a command prompt (On the windows desktop click 'Start', then select 'run' and type 'cmd'.
If you have mame installed directly in your C: drive then type cd C:\mame then press return. The command prompt should go to C:\mame.
Now type mame -cc (including the space between mame and -cc). You have now created your mame.ini and should be able to launch any valid games from your rom folder.
If mame is located anywhere other than C:\mame then you need to substitute the alternate directory at the first step.


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