So I went through the first Vault 74 tutorial thing and got to the step of testing the plug-in in the game. I started Fallout 3 and loaded the .esp file. Then I hit continue game. It says something along the lines of "content has been altered, some content may no longer be available. continue loading?" I figure this stems from the fact that Vault 74 still exists in the spot where you copied it from vault 108 and is therefore overwriting things. So I confirm the load and the game starts up fine. Except my entire display is black, aside from my HUD being fully functional. Pausing works like normal, I can hear myself walking around when I use WASD, but the game simply doesn't display any of the world. I tried quitting and reloading and that time a small section of the display was filled with random colored lines that would change slightly if I moved around, but aside from this, it is exactly the same black void. What could be causing this? And how do I fix this?

Any help would be greatly appreciated.