GPG Decryption issue

Dear Members,

I have felt GPG is easy to work with untill I this,

I’m trying to decrypt files and while doing this, there are different error messages I have seen,

c:>gpg --output p1.xml --decrypt NJS627113YBMKA.gpg

You need a passphrase to unlock the secret key for
user: “Navtech (Navtech Encryption) qantas.ifsmetrics@tcs.com
2048-bit RSA key, ID B66BF0A9, created 2011-07-11 (main key ID 1540F461)

gpg: onepass_sig with unknown version 235

c:>gpg --output p1.xml --decrypt NJS630028YPPHA.gpg

You need a passphrase to unlock the secret key for
user: “Navtech (Navtech Encryption) qantas.ifsmetrics@tcs.com
2048-bit RSA key, ID B66BF0A9, created 2011-07-11 (main key ID 1540F461)

gpg: block_filter 01670B38: read error (size=7424,a->size=8389888)
gpg: block_filter: pending bytes!

c:>gpg --output p1.xml --decrypt NJS629928YPPHA.gpg

You need a passphrase to unlock the secret key for
user: “Navtech (Navtech Encryption) qantas.ifsmetrics@tcs.com
2048-bit RSA key, ID B66BF0A9, created 2011-07-11 (main key ID 1540F461)

gpg: block_filter 017B0B38: read error (size=7091,a->size=3378)
gpg: block_filter: pending bytes!

c:>gpg --output p1.xml --decrypt NJS627704YBBNA.gpg

You need a passphrase to unlock the secret key for
user: “Navtech (Navtech Encryption) qantas.ifsmetrics@tcs.com
2048-bit RSA key, ID B66BF0A9, created 2011-07-11 (main key ID 1540F461)

gpg: [don’t know]: invalid packet (ctb=2f)

c:>gpg --output p1.xml --decrypt NJS627704YBBNA.gpg

You need a passphrase to unlock the secret key for
user: “Navtech (Navtech Encryption) qantas.ifsmetrics@tcs.com
2048-bit RSA key, ID B66BF0A9, created 2011-07-11 (main key ID 1540F461)

gpg: [don’t know]: invalid packet (ctb=2f)

c:>

Our source vendor encrypts with the public key sent by us. I was able to decrypt a sample one liner test file successfully first. Then I have asked them to send the actual data files encrypted. Now I’m not able to do that.

I’m GPG4Win 2.1.0 on Windows 2000 server.

I’m using a passphrase as well.

Please help me resolve this issue.

Thanks
Suresh