The notion of upgradeable GPUs in laptops didn't really catch on. A couple of companies toyed around with the idea a while back, but it just wasn't meant to be. Like the other guy said... as far as IGPs go... you got a decent one... so be thankful for that and hopefully this will be a learning experience. Other than memory and disk drives, it's really not that feasible to upgrade laptop hardware... some people will say CPUs are OK... but that's debatable.
Actually i found out something pretty strange. Apparently Best-buy replaces Graphics cards in laptops, the cost however is like 50 - $100... But they'll do the job.