ORA-12154 Error After Install of Enterprise Manager

I have a new new laptop with minimal software installed. Everything was fine and I was able to connect to 4 different Oracle 9i databases.
This morning I installed Oracle Enterprise Manager (10g) and now I get the dreaded ORA-12154 error.
I now find a copy of TNSNAMES.ORA in three places. I have copied the correct version to the two new 10G locations and I have verified that all three copies of TNSNAMES.ORA and SQLNET.ORA are correct and identical.
Do anybody have any idea what else could be wrong?

I am certain the TNSNAMES.ORA file is fine as it is "pushed" from a central IT department. I have compared it to the one on a second computer (which has only 9i installed) in my office and they are identical.
I examined the Oracle 9i directories and there was no LISTENER.ORA anywhere. On the 9i only computer the command - C:\>dir listener.ora /s /p executed in a DOS window returned no files.
Everything was working fine until I installed Enterprise Manager 10g (10.2.0.2.1).
I have TOAD installed and it connects to both of the 9i development and production databases, so I know the TNSNAMES.ORA is okay.
It woudl seem that there is a conflict between 10g and 9i Developer/2000.

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