Getting ORA-01031:insufficient privileges during first time login to oracle 11.2.0.1.0 database on my windows 8 PC I installed oracle database 11.2.0.1 on my windows 8.1 PC. I downloaded the zip files from oracle website viz. win64_11gR2_database_1of2 and win64_11gR2_database_2of2. 

I followed the installation steps and while attempting to login through sysdba, i got the insufficient privileges issue.
I used below command:

sqlplus "/as sysdba"

Please help me to resolve this issue.
There are some things which have to be set up correctly:


The user you are logged on has to be a member of the ora_dba operating system group.
The parameter SQLNET.AUTHENTICATION_SERVICES=(NTS) must be set correctly. It can include more options but "NTS" is required.
You have to connect to the database correctly which is: sqlplus / as sysdba. You can also add these quotes but that was Oracle 9i style. But you need a space betweed "/" and "as".



  Note: If you want to connect to Oracle as sysdba from a remote computer, you need a password file.