After install of instant client 10.2, error Message file sp1 lang .msb not

Question

Greeting.
I installed Oracle 10G. Was working great.
then installed PHP5. working great.
then TYPO3 (a web content manager) Still ok.
then I wanted TYPO3 to user my oracle 10g server.
One of the step was to install instant client (which I did)
Then I needed to reboot: My oracle 10G doesn't start anymore.
When trying SQLplus:
Error 6 initializing SQL*Plus
Message file sp1<lang>.msb not found
SP2-0750: You may need to set ORACLE_HOME to your Oracle software directory
I do have this file:
find / -name sp1us.msb
find: /proc/6014/task: No such file or directory
/oracle/product/10.2.0/sqlplus/mesg/sp1us.msb
here more info:
echo $ORACLE_HOME
/oracle/product/10.2.0
echo $ORACLE_SID
dubaidb
# lsnrctl start listener
LSNRCTL for Linux: Version 10.2.0.4.0 - Production on 21-AUG-2009 13:45:55
Copyright (c) 1991, 2007, Oracle. All rights reserved.
TNS-01106: Listener using listener name LISTENER has already been started
find / -name sqlplus -print 2>/dev/null
/oracle/product/10.2.0/inventory/Templates/sqlplus
/oracle/product/10.2.0/bin/sqlplus
/oracle/product/10.2.0/oc4j/j2ee/oc4j_applications/applications/isqlplus/isqlplus/WEB-INF/classes/oracle/sqlplus
/oracle/product/10.2.0/sqlplus
/oracle/instantclient_10_2/sqlplus
It seems I got 2 sqlplus files: one in /oracle/instantclient_10_2/sqlplus and /oracle/product/10.2.0/bin/sqlplus
Logs info from /oracle/product/10.2.0/startup.log:
/oracle/product/10.2.0/bin/dbstart: Starting up database "dubaidb"
Fri Aug 21 13:18:49 EDT 2009
Error 6 initializing SQL*Plus
Message file sp1<lang>.msb not found
SP2-0750: You may need to set ORACLE_HOME to your Oracle software directory
Error 6 initializing SQL*Plus
Message file sp1<lang>.msb not found
SP2-0750: You may need to set ORACLE_HOME to your Oracle software directory
Thank you in advance

Answer 1

Well, what I ended up doing is the following:
Unset LD_LIBRARY_PATH
Backed-up my sqlplus in ORACLE_HOME/bin.
Backed-up my libraried in ORACLE_HOME/lib
Renamed instantclient to instantclient_bck
copied all libraries from instantclient_bck to ORACLE_HOME/lib
copied sqlplus from instantclient_bck to ORACLE_HOME/bin
dbshut
dbstart
Everything came back as it used to be :)