Metro 2033

Hey guys, I have heard of people and have seen people on youtube changing their FOV, and I have followed instructions, but have not been able to see a change take place when I actually get into the game. Can someone please help me get to the bottom of why the FOV keeps resetting itself back to that horrible 45 setting? Also, I have even tried to use MODDB's custom Metro 2033 launcher to change FOV to no avail(I could not launch the game through it due to a strange error that it couldn't find the Metro 2033 exe.) Thanks