OK, ive been playing NV for quite a while now. When i first got it, i followed the guide here :http://filenetworks.blogspot.com/2010/10/fallout-new-vegas-fix-crash-freezing.html and appplied the dx9.dll fix as well as the Threaded AI thing. I installed a lot of mods and had lots of fun until recently. When the latest patch came out, it broke my save. I took the opportunity to uninstall the game, delete all the mods and make a fresh install of NV. I updated my drivers and purchased the DLC's and applied the fix mentioned above again. Now NV barely runs at all, i can get it running for maybe 10-15 minutes and then it crashes to desktop with no error message. And sometimes i have to reboot because i cant get any game engine to run after said CTD. Any help/tips would be greatly appreciated, i need my NV :(