Ok, the main offenders of this is Minecraft and a space-sim game called Evochron Mercenary. Minecraft: Everything works fine, but after several minutes, the video will freeze. However, I can still hear the game running, and can still interact with the game, but I'm unable to see anything other than the point the video froze. Evochron Mercenary: Everything works fine, but after several minutes, the video freezes upon entering the Shipyard, which is crucial for ship upgrades. Alt-tabbing allows the video to run again, but only as long as the game is not the active window. Once the window is active again, the video will stop again. Running Windows 7 Home Premium 64-bit, with an Nvidia GeForce GT 525M, and 6-8 GBs of RAM, if that helps.