Change the cputype setting from "auto" to "pentium_slow". You can do this by editing the dosbox.conf file in Notepad and changing the line "cputype=auto" to "cputype=pentium_slow", or at DOSBox's command prompt type the command "cputype pentium_slow" before starting Windows 3.

Thank you ripsaw, unfortunately I'm still getting the errors 🙁

Also try setting cputype=486_slow, and confirm that the setting is in effect (i.e. type "cputype" at the command prompt and get "486_slow" as the response) before running Windows 3. The "DOS error 21" is a common issue with Win32s, and changing the cputype will usually fix it.

Hi ripsaw, I've tried that too. I am getting 486_slow (or pentium_slow) as the response but the game still won't play. Is there anything else I can try?

Do you still get the "DOS error 21" message from Win32s with cputype=486_slow? I mean, the game might not work for any number of reasons, and changing the cputype was only intended to work around that one specific type of error.

You haven't mentioned whether you installed Win32s. It's not part of Windows 3.1 and has to be installed separately.

Check the guide and look under "Other drivers".

Windows 3.1x DOSBox Guide

Also according to the wiki any version below 2.0 needs Quicktime.