Instructions
MAME
Open a Web browser, and visit the MAME ROM download page. Click on one of the free games available for download, and save it to the "roms" folder in your MAME installation folder. For example, if you installed MAME at c:\MAME, save the game in the c:\MAME\roms\ path. Do not unzip the file.
Click the "Start" button, then insert the cursor in the search box. Type "cmd," and press "Enter" to open the command prompt.
Navigate the command prompt to the MAME. For example, type "cd .." to go back a folder in the prompt or "cd Program Files" to move into the "Program Files" folder. For example, if you installed MAME at c:\MAME, change the directory until the command prompt reflects this location.
Type "mame gamename," and press "Enter," but replace "gamename" with the name of the game you downloaded. For example, if you downloaded Star Fire, type "mame starfire," and press "Enter" to launch the game.
MAME32
Open a Web browser, and visit the MAME ROM download page. Click on one of the free games available for download, and save it to the "roms" folder in your MAME32 installation folder. For example, if you installed MAME at c:\MAME32, save the game in the c:\MAME32\roms\ path. Do not unzip the file.
Launch MAME32. Click "File" on the menu, then click "Audit all games." Wait for MAME32 to finish checking the status of all the games in the game list, then click the "Close" button.
Search for the game you downloaded in the Game list, and double-click it to launch it, or click "Available" from the left menu to see the games you have saved in the roms folder, and double-click it.