Oracle Database Discussions

Hi ,
iam trying to create a database manually .... my logfiles ,controlfiles and system file is getting created but later on mid it throws an error iam using o/s as windows and oracle 10g
create database krishna
*
error at line 1
ora-ora-01092:oracle instance terminated disconnection forced :

i have done the follwing steps :

1) create a service on windows
oradim -new -sid krishna

2) crete a passwordfile
orapwd file ='d:\oracle\oradata\pwdkrishna.ora password=krishna

3) sqlplus /nolog

4)connect / as sysdba

5) create spfile from pfile

6) exit

7)startup nomount

8) create database


i have tried it around 3-4 times but my database isn't getting created every time iam getting the same error
Kindly help..........

Thanks &Regards
Kavita