(RE: A suggestion for Ken Williams) I’ve successfully managed to run all the Sierra originals I own in Win98. The key is to configure the Resource.cfg file correctly. Also it is a good idea to run a utility like Moslo to reduce your clock speed. This gives the computer time to initialize the hardware required for the game. If this does not solve your problems, then running Win98 in DOS mode is your best bet.
Check out these sites below for some ADI versions of old Sierra and other games.
http://www.agdinteractive.com/
http://www.adventuregamestudio.co.uk/
MikeP.