Originally Posted by
YourMaster
Well, I'm sorry, I don't really have any experience with PCem. The mouse sensitivity is no problem in dosbox or original windows 98, and you mention other games work fine so it's in the interaction between DK and PCem somehow. You say you tried both keeper.exe and keeper95.exe and both give the same problem? Do you notice a difference between high-res and low-res mode? (Press Ctrl+R while playing a level).
Windows 98 has mouse sensitivity options itself, have you tried setting the speed there to unreasonably low levels? Are you sure PCem has fully captured your mouse?