To Enable Oracle Administrator DBA you should follow these Instructions
Windows xp
1. Run CMD
start menu –> Run –> CMD
2. write these line
set ORACLE_HOME=d:\oracle\product\10.2.0\db_1
(this is the oracle path if you use onother version line 10.1.0 just put it 
)
3. write
cd % ORACLE_HOME%\oc4j\j2ee\isqlplus\application-deployments\isqlplus
remove space between % and ORACLE_HOME
4. write
d:\oracle\product\10.2.0\db_1\jdk\bin\java -Djava.security.properties=d:\oracle\product\10.2.0\db_1\sqlplus\admin\iplus\provider -jar d:\oracle\product\10.2.0\db_1\oc4j\j2ee\home\jazn.jar -user “iSQL*Plus DBA/admin” -password welcome -shell
5. When sccessfull you will see
JANZ:>
if appear then write the next lines :
6. Now we will add new user to DBA : name=eadoking || password=oracle
adduser “iSQL*Plus DBA” eadoking oracle
7. Now we need to grand roles to eadoking so we should write
grantrole webDba “iSQL*Plus DBA” eadoking
8. final write exit and press enter
exit
9. You need to Stop Oracle Service so write the next line
isqlplusctl stop
10 Running Oracle Service again
isqlplusctl start
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Windows Vista and Windows 7
you should do the same steps but in
safe mode because of security
1. restart your pc and
2. press F8
3. select SAFE MODE
so easy Steps all tested by Eadoking
ANY QUESTION put it in comments
