Problem with CRYPTOAPI

Hi, i am using cryptoapi to encrypt my files. The files are decrypted if i decrypt them on the same system with same user, but if i try to decrypt them with different user or on different system, decryption fails. The function i am using to encrypt files are:-
        CryptAcquireContext();
      CryptGetUserKey(  );
        CryptGetUserKey(  );
       GeneratePrivateKey();
       CryptGenKey();
etc.
The fuction failing on decryption is
      CryptImportKey();
Can anybody tell how to decrypt files on a different system;
Thanks;