(re: King’s Quest VI Locks Up.)
Don’t know if this will work or not, but try turning your speed all the way up and detail all the way down. I have done this to get through similar lock-ups in the PQ1 remake and GK2.
I don’t know if there’s a patch, but you could check http://ftp.sierra.com — they have all their patches there, even the old ones. If you go to ftp://ftp.sierra.com/pub/pc/patches/ there is one called kq6cdhi.exe — you might want to poke around on the internet first (try putting the file name in google) to see if you can find out what the patch is supposed to do.