doubt about parameter files?

[4iappsDBA]

C:\Users\4i-Admin>sqlplus /nolog
SQL*Plus: Release 10.2.0.1.0 - Production on Wed Mar 17 11:44:12 2010
Copyright (c) 1982, 2005, Oracle. All rights reserved.

SQL> conn sys as sysdba
Enter password:
Connected to an idle instance.
SQL> create spfile from pfile;
File created.

SQL> create pfile from spfile;
File created.

OR

SQL> create pfile='C:\oracle\product\10.2.0\db_1\admin\sos\pfile\initsos.ora'
2 from
3 spfile='C:\oracle\product\10.2.0\db_1\database\spfilesos.ora';

File created.

i hope this will work.