Ouch, yah fraid unless the laptop started with a decreet style video card its not reasonable to try and replace the existing video solution with one. Fraid you're pretty stuck, that svcks buddy.
Oh man. So we're talking geek squad job here
Its a little beyond their expertise as well, this is the sort of thing a person with several years of custom build experience may try as a 'project', not something to reasonably just set out and do without an acceptance of the high potential of breaking the whole thing. IE I wouldn't try this on a laptop of my own unless I was very comfortable with the idea of accidentally killing it during the attempt.