Since the BSODs occured while or after gaming, then it may be related to a graphics driver. What you can do is download a software like Driver Fusion, clean out all existing graphics drivers, and then reinstall them. Be sure to install the latest non-beta drivers. If you have a pre-built computer from Dell, HP, or something, get the drivers from their website, otherwise get it from Ati/Nvidia. If this does not fix your issue, then it may be hardware related. Sometimes hardware issues may trigger driver crashes. While playing games, monitor your temperatures and see if they go too high. Anywhere over 90 when not overclocked can be considered high.