PGP Desktop doesn't seem to recognize my private key
I'm trying to transition from XP to Win7. I just installed Symantec Encryption Desktop v10 on Win7. I have been using PGP 8.0 on XP. The install seemed to go OK. Then I tried to encrypt a file with my public key and a friend's key, using the context menu from Win Explorer. Instead of creating a separate file, as 8.0 would have, it somehow modified the source file to some kind of encrypted form. When I try to decrypt the file, it says I don't have the private key to either of the public keys. Buit my private key does display in the list of private keys shown on the keyring display. I imported all the public keys and private keys from the key files I used with PGP 8.0. My keyrings are stored on a PGP encrypted virtual disk, so my private key has no passphrase. I don't know why it won't use my private key to decrypt the file. Back on XP, PGP 8.0 doesn't recognize it as any kind of PGP encrypted file, even if I rename it to xxx.pgp. As it is, I can't recover the file. Can somebody help me?