Firstly, make sure that you have cleared all ENB files out of your game folder (SteamApps\common\Fallout New Vegas)
Find the ENB D3D9.dll file within the enbseries_falloutnv_v0267.rar and put it in your game folder (link directly above)
Now grab all the files from the Oxide ENB archive (except for the Data folder) and place them in your game folder as well.
Then install the files from the data folder (of the archive of this ENB) to your game (manual or via a mod manager, I suggest M.O.)
Next make sure you TURN OFF anti-aliasing and anisotropic filtering in the games launcher.
If it is still crashing make sure that you have FNV4GB Installed and if that doesn't stop it then maybe your computer is not capable of running it. If you think that is the case you can send me the specs and I'll see if this is the case