try screenshotarchive again, download the emulators they have on the site and use those. Follow the settings exactly.... hundreds of us have set them up using those instructions... they work.
Check your file extension perhaps? did you unzip all your rom files and still have the setting as ".zip" If you unzipped them, you'll have to set it to the emulator specific file type (.smc, .nes, etc)
Make sure your directory paths are spelled correctly, and use the correct slash ( "\" ), although I'm not sure that matters in MameWah... just throwing out ideas.