How to stop automatic updates in vista (www.pcdocpro.com)

http://www.pcdocpro.com/ Do you know all the updates Microsoft provides are not necessary for all the users using it. Some of the updates pertaining to various other applications are not needed and still they get installed in your PC. Due to continuous updating it occupies huge space and some times resulting in many PC errors and slow PC as well. You may stop the automatic updates and can allow only those are needed to your PC.