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Unable to login after installation

I installed Oracle8i on Windows 2000 server. After installation, I logged in with the username SCOTT and password TIGER. Then I restarted the system once. Again when I try to login, I get the error message "ORA-01034 : Oracle not found" and "ORA-27101." What should I do?
The ORA-1034 error indicates that your database is not running. You will need to start it first. Go to Control Panel->Administrative Tools->Services. Scroll down the list and start the OracleSIDService service (where SID is your database identifier). This will start the database for you. If you want the database to start automatically at reboot, make sure this service is set to AUTO. You should now be able to sign on to your instance.

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