ORA-03121 After installing Gateway

Hello Experts,
i am trying to connec to MS Sql Server 2000 on remote win2003 machine by using my machine which is WinXP Oracle 10g 10.1.0.2. I installed and configure Gateway as well which is on diffrent home than the oracle in my machine.
when i issue command on SQL Prompt
connect imosadmin/imos@odbc:dsnimos
i got
ORA-03121: no interface driver connected - function not performed
where as dsnimos is a dsn to MS SQL Server2000
and imosadmin/imos is a username and password for the database.
After doing all this my other database services also stop working :(
Please check the configurations which i made as well may be i am wrong somewhere.....
For further info i am pasting my configuration files.
Gateway Home C:\OraHome_1\network\admin\listener.ora
LISTENER =
(ADDRESS_LIST=
(ADDRESS=(PROTOCOL=tcp)(HOST=zahid)(PORT=1522))
(ADDRESS=(PROTOCOL=ipc)(KEY=PNPKEY)))
SID_LIST_LISTENER=
(SID_LIST=
(SID_DESC=
(SID_NAME=tg4msql)
(ORACLE_HOME=C:\OraHome_1)
(PROGRAM=tg4msql)
Rest everything is commented
Oracle Database home C:\oracle\product\10.1.0\Db_1\NETWORK\ADMIN\listener.ora
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = zahid)(PORT = 1521))
C:\oracle\product\10.1.0\Db_1\NETWORK\ADMIN\tnsnames.ora
tg4msql=
(DESCRIPTION=
(ADDRESS= (PROTOCOL=TCP) (HOST=zahid) (PORT=1522) )
(CONNECT_DATA=
(SID=tg4msql))
(HS=OK))

ORA-12154 means that the Oracle database cannot resolve the tnsnames entry 'tg4msql'. Just make sure that your oracle database has the following entry in the $ORACLE_HOME/network/admin/tnsnames.ora entry:
tg4msql=
(DESCRIPTION=
(ADDRESS=
(PROTOCOL=TCP)(HOST=zahid)(PORT=1522)
(CONNECT_DATA=
(SID=tg4msql)
(HS=OK)
But checking your config you have...
To start with, activate an sqlnet trace on your database, add following lines to the sqlnet.ora in your C:\oracle\product\10.1.0\Db_1\NETWORK\ADMIN\ path:
TRACE_LEVEL_CLIENT=16
TRACE_FILE_CLIENT=client.trc
TRACE_FILE_DIRECTORY=C:\TEMP
and restart your SQL*Plus session and try the select again. This should generate a sqlnet client trace which hopefully will show why the database cannot resolve 'tg4msql' to the tnsnames.ora entry specified. For example are you using the TNS_ADMIN variable?
Regards,
Ed

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