How do I hook a laptop Dell computer to a Pioneer Elite sc-25?

www.pioneerelectronics.com/PUSA/Home/AV-Receivers/Elite+Receivers/SC-25

First you have to figure out what you are trying to connect and which way you want it to go. After all, this unit apparently does a lot of things, and there is no answer when you don't know what the question is.

I suggest you poke around the site and see if you can download a manual.