Well it depends. Some laptops can be upgraded others cannot. You need to contact the maker and see what they say. Also look into laptop GPU's and see if they are compatible with your model. Your maker may say NO just on principle. I find the whole thing a hassle and would upgrade the whole stinkin thing.
Agreed. Laptop video cards are not really meant to be upgraded. If they do happen to be removable(which you're MIGHT be...) they still are usually work "per brand" and are much more expensive than a comparable desktop video card.