I've given up trying to get Fallout NV to work at an acceptable rate on my machine so it's been uninstalled and placed in my 'played' cupboard.

One day, who knows, it may be resurrected just in case the required fixes have been produced or I'm using a PC with a spec so great that it eats FNV for breakfast. Actually, the latter is probably unlikely to happen as many users with what appear to be monster PCs hvave given up too!

I'm not playing the game using low graphics settings - why should I?

I may even try something I've never tried before and that's to obtain a refund from the supplier. You never know?

Why do you post this in the support forum, if you are not even giving any information about your setup?

If you want, please post your DXdiag, and there might be someone able to help you get this game going.