sql server 2005

Question

hi
i have installed SQLserver2005, after completed the setup when i enter into management studio and after opening database engine their is no server in server name combo,,
also when i try to connect it by enterring my computer name as server it gives me following error messege cannot connect -- mssql server error 53.
do i need to start service manager like 2000 version as not in 2005
plz advise
thnaks in advance