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Oracle listener affected by new Service Pack 2

I'm on Windows XP and I just upgraded to a new Service Pack 2. It seemed to affect my Oracle Listener. I get ORA-12541 errors now when I try to connect, no matter how I try to connect. This was not happening before and my TNSNAMES.ORA and LISTENER.ORA files are not changed and have the appropriate entries. Help!

I'm on Windows XP and I just upgraded to a new Service Pack 2. It seemed to affect my Oracle Listener. I get ORA-12541 errors now when I try to connect, no matter how I try to connect. This was not happening before and my TNSNAMES.ORA and LISTENER.ORA files are not changed and have the appropriate entries. Help!
The ORA-12541 error usually indicates that there is no listener running. Make sure that the listener has been started on the database server.

It is also possible that the upgrade to SP2 may have affected connectivity to your database by turning on the Windows firewall automatically. From the Control Panel, disable the firewall and see whether this resolves the problem.

Dig Deeper on Oracle database installation, upgrades and patches

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