You can try turning down many of the graphics options, or playing at a lower resoution. You could also try a reinstall, but not sure if that will have any effect. The 258.96 drivers are regarded to be the last known release of drivers that will work properly with ME/ME2, you could try newer ones, but you might find other graphics glitches starting to appear.
The problem with playing on a notebook is that mobility (or M class) chipsets are never implemented into the mainboards of the notebooks according to any form of standard, so performance and functionality not only varies from manufacturer to manufacturer, but also between motherboard revisions. They also lack many of the features of a fully fledged desktop card as well. Also, they are prone to overheating issues, as the CPU and GPU chips are in close proximity, with very little airflow or cooling to help them out.