DOS Box - there are some shareware programs that get you a window running a C:/ prompt, and Windows also has Start-Accessories-Command Prompt to do that as well. Problem is that it is an incomplete DOS, so some programs don't like ti anyways.
WINE - Windows Emulator. The advantage is that there are WINEs for everything from Win 3.1 to 95 to XP. They tend to be memory hogs, but might still be just what you need to run that game.