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cygwin bash #! error: bad interpreter


I am creating some scripts and I get the following error:
	bad interpreter: no such file or directory

Most machines that have cygwin installed work fine.  But one machine reports
this error when I use:
#!bash
  OR
#!perl

BUT the error disappears when I use:
#!/usr/bin/perl
#!/usr/bin/bash

And to confuse the matter even more, if I do (on the violating machine):
which perl
  OR
which bash

I get:
/usr/bin/perl
  OR
/usr/bin/bash

I have reinstalled cygwin several times and looked for anything in the setup or
configuration that might cause such a problem, but I have had no luck.

ALSO suspect: when i do "vi script" from cygwin I see ^M's at the end of lines. 
I don't get the same problem on other machines with cygwin.  I did remove the ^M
and still had the same problem with my script.

ALSO after seeing an email on this same subject I deleted the regestration keys:
HKEY_CURRENT_USER/Software/Cygnus Solutions
HKEY_LOCAL_MACHINE/Software/Cygnus Solutions
AND then reinstalled.
WHICH STILL DIDN'T work.

Is it possible that I am using a bad setup.exe?
I have reinstalled from a local drive (with packages downloaded in October
2001).

ANY IDEAS?

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