All Component in one Computer.

OS：Windows XP SP3  
RAM:1G  
HD:120G  
CPU：Intel Core Duo T7500 2GHz
Database: Oracle 10g

Installation steps are very easy, you only need to follow the installation wizard, and cllick Next, Next and Finish, That's all. Following is the order of Installation.

1.Cognos 8 BI Server 8.3
2.Cognos 8 BI Modeling 8.3
3.Cognos 8 BI Metric Server 8.3
4.Cognos 8 BI Server 8.3 SP2 Windows(Optional I think, Suggest don't install this Patch, Since I can't find some components' link at the start page of Cognos Web after Installation of this Patch,such as Analysis Studio, Report Studio, Query Studio and Event Studio)
5.Cognos 8 BI Metric Modeling 8.3
6.Cognos 8 Business Intelligence Quick Tours
7Cognos 8 Business Intelligence Samples 8.3

1.Create a Oracle User named like 'COG_CNT_STORE'  for Content Store,Grant Connect,Resource,DBA Role to it.

2.Create another Oracle User namded like 'COG_MET_STORE' for Metric Store,Grant Connect,Resource,DBA Role to it, Additionaly you should execute following SQL COMMAND as SYS DBA:
GRANT EXECUTE ON DBMS_LOCK TO COG_MET_STORE;
ALTER USER COG_MET_STORE QUOTA UNLIMITED ON USERS;
GRANT CREATE TABLE TO COG_MET_STORE;
GRANT CREATE TRIGGER TO COG_MET_STORE;

3.Copy the Oracle JDBC Driver 'ojdbc14.jar' from ORACLE_HOME/jdbc/lib to c8_location/webapps/p2pd/WEB-INF/lib

4.JAVA_HOME set up

5.Config IIS as Web Server, Create two virtual directories like:

6.Start Cognos Configuration, Delete Default Content Store Connection, Create a new Content Store Connection with the Oracle User 'COG_CNT_STORE' we previously created.

7.Start Cognos Configuration,Specify a Mail Server Account and Notification Database

8.Test and Start Cognos BI Server