Light/Graphics/ Idunno what bug

[AltsiMonkey]

So, I searched through the forums, internet and youtube, and I only found one guy with the same problem as I do. He's been struggling with it for almost a year, and still haven't solved it. Here's the video of what's wrong:

http://www.youtube.com/watch?v=1HgqSWZVM18


So basically it seems like most of the environment and item textures are completely missing, making almost the whole game pitch black. When the lantern is on, some of the surfaces turn orange/yellow, like they were lighted. Anyways, my computer should run the game (ahhaha, you lost the game) well, having good enough graphic cards and stuff (I guess?), but it's still almost completely unplayable. Some help would be appreciated here.