starting database service in win xp

Hi all
as per below error, oracle is already running when I attemp to do startup after I manually start oracle service manually. Is it instance get started when the service is started? But I tried some time back (not on this machine) 1. first I started the service then 2. I have to startup the database. Can you please explain give me suggestion.
Thanks for your help.
Regards
Bhaskara
C:\Documents and Settings\bhaskara>set oracle_sid=test1

C:\Documents and Settings\bhaskara>oradim -startup -sid test1 -starttype srvc

C:\Documents and Settings\bhaskara>sqlplus /nolog

SQL*Plus: Release 9.0.1.4.0 - Production on Fri Jul 29 02:14:51 2005

(c) Copyright 2001 Oracle Corporation. All rights reserved.

SQL> connect system as sysdba
Enter password:
Connected.
SQL> startup
ORA-01081: cannot start already-running ORACLE - shut it down first
SQL> exit
Disconnected from Oracle Database 10g Release 10.1.0.2.0 - Production

when you start the service, you are starting thew database as well.
oradim has options to control whether that happens or not, you probably set it to autostart