i took a quick stab at it.
go back to mame.net, click on Downloads, then click on Other Ports, then the first one called MAME32, it will link you to another site, then click on Downloads, then decide wether you want MAME with an installer or without, the installer did not work for me. so i got the zipped one.
before you download it will ask you to sign in.
for the log in use the first three letters of my real name and my last name and as the parseword put YOUR four letter parseword, of course this only works for Rob, everyone else must register their own crap.
Once installed or unzipped, start the program, if you unzipped it, go to the folder where it was unzipped, write this down when unzipped, or remember where you did so, i unzipped in my documents. Once the program is loaded hopefully it will be familiar to you from when you said your friend had it. You will see a list of Games. You can not play these yet. You need to Hunt Down the ROMS. I found a few on the net. Pac Man and another.
Once you find the ROMS they will be ZIPPED. Dont unzip them. Save the Zipped File inside the folder called ROMS where you unzipped MAME or installed it.
Once the zip is in there, refresh the MAME program by hitting F5 on your keyboard. Next scroll to the name of the game. If it is the right ZIP the little box next to the name of the game will be Green. This means it is ready to be played. Double Click it.
then follow the onscreen instructions.
to play the game you have to insert a quarter, do this by hitting the Five key.
get it? got it? good.
--Sal-