So the other day I started up Fallout New Vegas again after a break and I come back to some guns with awful big black pixelated sqaure shadows on them and when ever I look a few inches infront of me everything is blurred to hell and also the ground literally looks like the minecraft texture for rock and I don't understand why.

I have no mods installed and I've reinstalled.
My rig
Intel Quad core 2.40ghz
Nivida geforce 275 gtx 800mb
3 gig Ram
Windows 7 64 bit

It was fine earlyier but I came back to it the other day and everything looks like a ps1 game apart from under my feet.

I'd make a wild guess that the .ini graphic settings are, for some reason, being continually set to low settings. Or something to that effect. Why, I don't know. Is the game launcher options menu showing the proper card & resolution detected/being used?

Beyond that simple possibility, I don't know. Other games look fine I take it?

Yeah everything else is perfectly fine

http://img861.imageshack.us/i/42859948.jpg/

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Here is a screenshot.

I really need help please I want to play Fallout New Vegas