Updating my computer for better gaming HELP

I'm not very knowledgeable about computer hardware, and I'm looking to upgrade my PC to play games better. I've been more a console gamer for the majority of my life, so I could use a little help on what I need to do. My computer spec are here: http://i.imgur.com/POO5X.gif. From searching other topics, I think all I really need is a new video card and a new power supply so my computer can handle the card. Any suggestions on what the best to get is? Or if I need anything else? I basically just want to play Skyrim at the highest settings.