If you modify an FOV value and die before reaching a checkpoint, your FOV is going to get reverted to a value from the last checkpoint.
Also to answer the Question about the can't see my server?
when I go on to multiplayer I can load in fine but when I go to join a server and click refrsh nothing happens it just says finding master server.
I did the LAN internet connection and still no servers. You can change your code key in the reg file in your game just open it with notepad at the bottom you'll see code key just change that it's 20 number and letters then just goto file click save then double click the reg file hit ok and your done.
If you still can't get a Lan game going then goto your regedit file after doing the reg look for the game in software you'll see it there under Activision click on that file then click on COD4 to your right you'll see codkey click on that put in your new key close and start the game it's that easy I have 5 computers in my house with the game one acting as the server the others we lan on works great.
If lets say you have a friend that let you use the game but you don't have a key look around or go buy your own game with one ethier type of key will let you play on lan if you don't have a "good key".