Ok. Just set this up on another PC took me all of about 5 minutes from download to running games. Grab the main zip file and the support files from the download site
http://mamewah.mameworld.net/downloads.htm Unzip the mamewah 1.61 to any directory you want (I used mamewah) and unzip the support files to a temp directory(I used temp). From the temp director double click the SETUP.BAT file. Reboot system if the PC doesn't do it for you.
Mame setup. Get the WINDOWS COMMAND LINE version of mame. Unzip it to a dir called MAME. Make sure this is in your root directory ( C:\MAME ). Put one or 2 roms in the roms directory. No more. We are testing.
Mamewah should start at this point (click the mamewah.exe file). If it doesn't you botched the support files install.
Once mamewah starts hit your 2 key. The 2 key above your normal keys - not the one on the keypad. Game List Options will show up. Hit the 1 key on game list. Hit the 1 key on Generate list. The 1 or 2 romes you used should show up and htting the 1 key on any game will launch it.
If you want to deviate from my simple plans be prepared to do some reading...
Don