Can you upgrade from the Mobile Intel 4 series chip set to a more powerful set u

You mean Intel 4500MHD for laptop? I don't think so, laptops that has such graphic cards usually don't allow owners to add some additional graphics card. But what you can do is if your laptop has a place for extension cards (it's called 34mm PCI/Mini PCI-E/Laptop expansion or something), you can get ViDock http://www.villageinstruments.com/tiki-index.php?page=V...

Which can lets an additional External graphics card to be working with your laptop. But there is two problems: You need new monitor and it's going to cost you a lot. Maybe up to $500, so you may sell your laptop and get a new better one which maybe cost like $800.