I'm thinking I need to upgrade my laptop computer's RAM. My computer has been lagging a lot lately when a lot of stuff is open. I am a noob when it comes to computer stuff so I'm just trying to get some direction here. What options do I have exactly? I've got a Compaq Evo N800c with only 256MB RAM. What are some good sites to order upgraded RAM that will work with my laptop? Thanks in advance.