programs running in background

I'd like to eliminate any unnecessary programs running int he background. Can anyone provide a list of the needed programs that should begin on "start up" and those that can go?

Thanks,

jcchev

Hello...

Can you post all the programs that are running in the backround, so I can tell you what to close..

Also Ccleaner is a great software to disable programs on the backround and when you boot up..