ORA-12514 error on server with both 9i and 10g on same machine

I have an Oracle server which I've been using to support 9i db application development. There are a number of existing 9i db's on it. I have recently begun a project using 10g. I figured that I could use the same machine. I made sure that the 10g home was different than the 9i home. I tried having the 10g listener listening on the same port and on a different port than 9i. No luck. Unfortunately, none of my db's work now. I think my poor computer is confused with both 9i and 10g on it. Is there anyway to support both on the same machine? Is there a way to resolve the current conflict so I can at least make the 10g db work without scragging my 9i db's? Below are my .ora files for both 9i and 10g:

///////////////////////////
10G Listener.ora
//////////////////////////
LISTENER_10G =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = Pavonis)(PORT = 1521))
      )
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
      )
    )
  )

SID_LIST_LISTENER_10G =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = C:\oracle\product\10.1.0\db)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (SID_NAME = BDA)
      (ORACLE_HOME = C:\oracle\product\10.1.0\db)
    )
  )
///////////////////////////////
10G - sqlnet.ora
///////////////////////////////
SQLNET.AUTHENTICATION_SERVICES= (NONE)
NAMES.DIRECTORY_PATH= (TNSNAMES)
///////////////////////////////

//////////////////////////////
10G - tnsnames.ora
//////////////////////////////
BDA =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = Pavonis)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = BDA)
    )
  )

EXTPROC_CONNECTION_DATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
    )
    (CONNECT_DATA =
      (SID = PLSExtProc)
      (PRESENTATION = RO)
    )
  )
/////////////////////////////

XXXXXXXXXXXXXXXXXXxxxx

/////////////////////////////
9i - listener.ora
/////////////////////////////
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = Pavonis)(PORT = 1521))
      )
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
      )
    )
  )

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = C:\oracle\ora92)
      (PROGRAM = extproc)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = STELLA.TITTLERS)
      (ORACLE_HOME = C:\oracle\ora92)
      (SID_NAME = STELLA)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = AODB)
      (ORACLE_HOME = C:\oracle\ora92)
      (SID_NAME = AODB)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = NIMS)
      (ORACLE_HOME = C:\oracle\ora92)
      (SID_NAME = NIMS)
    )
  )
///////////////////////////////////////

///////////////////////////////////////
9i - tnsnames.ora
///////////////////////////////////////
STELLA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = Pavonis)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = STELLA.TITTLERS)
    )
  )

NIMS =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = Pavonis)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = NIMS)
    )
  )

INST1_HTTP =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = Pavonis)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = SHARED)
      (SERVICE_NAME = MODOSE)
      (PRESENTATION = http://HRService)
    )
  )

AODB =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = Pavonis)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = AODB)
    )
  )

WMD =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = PAVONIS)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = WMD)
    )
  )
/////////////////////////////////////////

///////////////////////////////////
9i - sqlnet.ora
///////////////////////////////////
SQLNET.AUTHENTICATION_SERVICES = (NTS)
//////////////////////////////////

Thank you very much,
Julie