Hi,
If you have no backup of your control file then you should create new control file with current database structure.
STARTUP NOMOUNT
CREATE CONTROLFILE REUSE DATABASE "ORCL" NORESETLOGS ARCHIVELOG
MAXLOGFILES 16
MAXLOGMEMBERS 3
MAXDATAFILES 100
MAXINSTANCES 8
MAXLOGHISTORY 7271
LOGFILE
GROUP 1 'C:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\REDO01.LOG' SIZE 10M,
GROUP 2 'C:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\REDO02.LOG' SIZE 10M,
GROUP 3 'C:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\REDO03.LOG' SIZE 10M
-- STANDBY LOGFILE
DATAFILE
'C:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\SYSTEM01.DBF',
'C:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\UNDOTBS01.DBF',
'C:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\SYSAUX01.DBF',
'C:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\USERS01.DBF',
'C:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\EXAMPLE01.DBF',
'C:\ORACLE\PRODUCT\10.1.0\ORADATA\ORCL\USERS02.DBF'
CHARACTER SET WE8MSWIN1252
;
regards
Taj