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Here is the fix:
DB must be MOUNTED, not OPEN.
SQL> alter database drop logfile group 2;
SQL> alter database add logfile group 2
('C:\ORACLE\ORADATA\HYDRO\REDO02.LOG') size 100M;
SQL> alter database drop logfile group 3;
SQL> alter database add logfile group 3
('C:\ORACLE\ORADATA\HYDRO\REDO03.LOG') size 100M;
SQL> select * from v$log; -- check the status of new ones will be
UNUSED
SQL> alter database open; SQL> alter system switch logfile; SQL> select * from v$log; -- check that the CURRENT group is changedReceived on Thu Aug 25 2005 - 12:25:34 CDT