trouble with smime

[Bill Day]

I have openssl installed on Windows 8 (64-bit) and I am using Emacs 24.3 with 
gnus.  I can verify my certificate, and I can send smime signed email.  The 
problem is that when gnus tries to decode smime signed email sent to me, it 
produces the following error message:


[[S/MIME Signed Part:Failed]
OpenSSL failed to verify message integrity:
-------------------------------------------
Can't open output file /dev/null
3828:error:02001003:system library:fopen:No such 
process:bss_file.c:169:fopen('/dev/null','w')
3828:error:2006D080:BIO routines:BIO_new_file:no such file:bss_file.c:172:
]

If anyone has any suggestions on how to troubleshoot, I would be very grateful.

Thanks,

Bill Day