Can you hook a cpu to a lap top?

You mean "Can you hook a PC to a Laptop"?

A cpu is a 1inch x 1inch piece of silicon that sits on your motherboard inside your computer. It usually has a fan on it. You cannot hook it to anything and it does not contain any information in it.

Why not burn your inportant data on your PC to a dvd and then install it on your laptop.

What you can do is remove the HDD from your "CPU" ( he means PC) get or borrow a external SATA/PATA to USB Casing, they are very cheap, depending on your HDD if it's a SATA or a PATA one and connect it to your laptop using the External Casing and the USB connector provided and recover/retrieve the data that you want from your PC to your Laptop. And then you can burn it to any medium you want to.