OK, I just made a mess. I installed a few New Vegas mods this morning (Poco Bueno Textures, Enhanced Shaders, Weapon Retexture) and the game seemed to behave fine.
I reloaded this evening and there were artifacts all over the place, not to mention almost immediate crashes. I deactivated the mods using FOMM, and that didn'f fix anything. I uninstalled all mods, and that didn't fix anything. I uninstalled FOMM, and that didn't do anything either. Then I made Steam check the integrity of the game's cache, and it redownloaded one tiny file. I still get artifacts and immediate crashes, even on older saves from before the mods.
Does anyone know a way to fix this without having to redownload all 9 fucking gigabytes again? That should teach me not to use (New Vegas) mods...
EDIT: I need help! Now it seems that other DX11 games also have artifacts that weren't there before! For example, Batman Arkham City shows weird spikes coming out of Batman's fists and elbows, and random lines show everywhere. This wasn't happening yesterday or even this morning! Any idea what might be going on? This driving me crazy, it's very frustrating!
Btw, I have a GTX 560 Ti and driver version is 304.79
EDIT 2: OK, after battling with this issue for well over an hour, I tried downloading the newest beta drivers, 306.02, and doing a clean install. Then I turned off my computer and then back on. I tried Batman AC and it seems the artifacts are gone! Now the question remains: what the hell happened!? Can video card drivers corrupt just like that? Could it be that the computer "decided" to give me hell and simply not load the drivers properly until I turned it off? I did restart multiple times though. I have all sorts of crazy theories now. And just in case you need to know, the temperatures never reached 70º C, so it was not overheating.
FYI, I deleted all of New Vegas and decided to redownload overnight or sometime tomorrow. What a night... all I wanted was to play a game, not battle to the death with a demon possessed computer.