Thanks for all the info Haldrie and the work you've put into it. I'm guessing everyone can follow it so easily that there's no questions needed. I don't use it myself as I'm more an arcade person. Keep up the good work!
I went to google and the first find was the manufacturers site with a driver dated for last month. http://www.ralinktech.com/supp-1.htm assuming I've correctly understood your question that is.
MESS is a lot easier as each zip usually only contains one rom, and the sets don't interact much. If it's incorrect it could be 1. wrong crc - you need a newer set 2. bad or no dump - ignore these errors 3. missing - get a newer set