Oracle gives error "ora-24327: need explicit attach before authenticating a user" and dows not work

We are using oracle for an accounting software for the past 2 years.  

Suddently yesterday oracle stoped working.  

We restarted the machine, and the oracle services individually but without success.

We are executing the below command to start oracle:

E:\oracle\product\10.1.0\Db_1\bin\oradim.exe -startup -sid ORCL -usrpwd oracle

we get the error "ora-24327: need explicit attach before authenticating a user"

Can anyone help?
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You check check your environment variables and sqlnet.ora.

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AJKBOCAuthor Commented:
We added the SID of our dbase in the listener.ora.

Also commented out the authentication in sqlnet.ora file.
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