as the other posters have said, it might or might not be able to be upgraded, yours sounds like onboard graphics, but i do know of some laptops that you can get gfx cards for, the the blue screen of death (BSOD) is most commonly caused my bad drivers or poorly seated hardware, but in your case i think it may be a driver unless something has come loose inside, update all, do a bit of maintenance see how it goes, contact the supplier or brand and enquire about upgrades