|You probably could have it changed if you were determined but i'm sure its going to cost you quite a bit.|
pre built laptops (and desktops) are usually built with roughly the same standard parts so you might find that your motherboard might not be able to function as fast as your new cpu so you may not get a great deal out of your upgrade.
i cant find your motherboard online so i cant look it up. But really... I wouldnt do it.
If its running slow, why not look at formatting and start fresh? and defrag any other partitions?
also end all unnecessary processes in task manager.
Sorry cant help you further (im more of a desktop fanatic!)