What is a good registry cleaner?

I just purchased a new HP laptop with Vista on it and was hoping that
someone could point me in the direction of a good registry cleaner. I was
told that Windows Vista is proscessor intensive and was hoping to keep the
laptop running smooth. I also wanted to get rid of all those preloaded
software offers and things that seem to come standard on computers these
days. You know the AOL and other programs that dont show up in the
add/remove software folder or if they do you cannot delete them.

Any suggestions would be much appreciated.

thanks