Hi Folks,
One of our dba is not there and his group lost disk on NT box. NT admin rebuild that disk and asked me to restore the files from backup. So i went there and noticed that system datafile are misssing. I went to backup tool and copied from their. Then i followed these steps.

DOS PROMPT
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1.FIRST I CHECKED THE ENV BY ISSUING THE COMMAND

c:\oracle\ora8i>set

2. I noticed that ORACLE_HOME IS THERE BUT ORALCE_SID IS NOT THERE IN THE ENV. SO

c:\oracle\ora8i>set ORACLE_SID=SIDNAME

3. Again i checked the env and now sid name is there in env. Then i connect to the svrmgrl.

c:\oracle\ora8i>svrmgrl

svrmgr>connect internal

At this stage it's asked me the password, I don't know the internal password but i know the sys password. So i gave the that password. It's connected. Then

svrmgr>startup mount
ora 01031 insufficient privileges;

So i exit from svrmgrl and connected to sqlplus

c:\oracle\ora8i>sqlplus

username: internal as sysdba
ora 01031 insufficient privileges;

I am new to NT, So if anybody will give some idea it will help me.