Unable to decrypt/verify from own machine

[20 Ton Squirrel]

The Setup
I run Windows XP using GnuPG version 1.4.10.  

A client and I have exchanged our keys.  I successfully imported his key and
attempted to encrypt a file to send him.  My command line is as follows:

gpg --passphrase mypassphrase --compress-algo 1 --cipher-algo cast5 -u
me at myemail.com -r client at hisemail.com -o
C:\user\encryption\out\targetFile.xls.gpg -se
C:\user\encryption\in\targetFile.xls

The Problem
When trying to decrypt or verify the encrypted file, I get the following
error:
No secret key available Keyring does not have the secret key
(0xA352B4E9003B38FA) needed to decrypt this message.

My key's ID is 1F1EA8F8 and the client's ID is 5872AF6A.  I have no idea why
it would be asking for A352B4E9003B38FA.

This is likely a beginner's mistake, but I'm at a loss!

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