Multiple oracle homes problem

Hi!
I have multiple oracle homes on my machine: Oracle9DB, DevsuiteHome_1 and now as I have just installed Oracle Discoverer 10g....BIToolsHome_1.
The problem is ever since I installed Discoverer, nothing is working......
Can anyone help?
Best regards,
Aparna

Dear Rod,
What I mean by nothing is working is I cannot connect to the dataases. I get 'No listener' error message.
Oracle Hone selector gives the following message:
The is only one Oracle Home defined on this machine and so this tool cannot be used to change your primary Oracle home.
I tried to start the listener service, however, it says:
Listener service started and then stopped.
Is there any solution to this problem?
Thanks and best regards,
Aparna

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