here's the deal; the laptop you have is build around the sandy bridge CPU from intel. now that cpu architecture actually houses a gpu within the processor. soin effect you have a gpu on that cpu and you also have a dedicated GT520
i don't know if you have both GPU drivers installed but that will cause some errors during games.
btw the GT520 is better than the intel you have now on your laptop.
oh, welcome to the forums, newcomer!