About the divide 0 problem… You know you can skip the compatibility tests! The setup asks you if you really want to skip the tests or something and then continues with the installation. Just try it. So you didn’t waste your money 😉
About King’s Quest 6…
Did you try to use another resolution? 800*600 or even lower? Also try to use the 256 Color option instead of 16 or 32 Bit.
Hope this helps 😉