Ora-27101: Shared Memory Realm Does not exist

I m getting this error since 2 days, I m using Oracle 9i on Windows NT Server,
Also where would i find the alert.log file in my folder
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Startup the listener:
c:>lsnrctl start

Look if the ORACLE_HOME variable in Registry points to a valid set of Oracle software.

Startup the instance:
c:>sqplus /nolog
SQL>connect sys/password as sysdba
SQL>connect / as sysdba

alert<SID>.ora is in the admin directory pointed by the ORACLE_BASE variable.

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Your instance hasnt been 'created'

Before starting it up, you will need to start the service OracleService<SID>, and then start the instance if it doesnt start automatically - schwertner's code should work fine.

Your alert log will be found wherever the background_dump_dest is set to in your init.ora/spfile.
or if you get your instance started, from SqlPlus
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