connect SYS/ORACLE AS SYSDBA
startup mount 
ALTER DATABASE RENAME FILE
  'c:\oracle\oradata\o817\log1b.rdo',
  'c:\oracle\oradata\o817\log2b.rdo'
TO
  'c:\oracle\oradata\o817\archive\log1b.rdo',
  'c:\oracle\oradata\o817\archive\log2b.rdo'; 
alter database open;
SELECT * FROM v$logfile;
