trouble installing Python-2.2a1.exe

[Tim Peters]

[Tom Good]
> I downloaded the Python-2.2a1.exe installer from SourceForge, and
> verified that the MD5 sum is correct.  When I run it under Windows
> 2000 Professional [Version 5.00.2195], I get an error dialog that
> says:
>
> 16 bit Windows Subsystem
>
> The NTVDM CPU has encountered an illegal instruction.
> CS:020c IP:0115 OP:0f 00 00 00 00 Choose 'Close' to terminate the
> application.

[also Tom Good, later]
> Sorry, I had thought that this was a problem with the installer, but
> it really turned out to be a problem with my Windows configuration.  I
> fixed it.

Would you please spell out what you changed?  I saw anther report of this
symptom, a few months ago (w/ a different installer), but no follow-up.  I'd
like to know how you cured it so we can help the next person who falls into
this trap.