I have this problem with Fallout 3/Fallout:New Vegas/ and Oblivion

I make a change to something in an INI file and I save it. Once the game is launched, the tweak/change I made to the game through the INI file is nonexistant.
Example: Oblivion- I change the variable "imingrasssize" to 160, which is considerably more than the default number, but ingame there is no difference in grass size.
Fallout:New Vegas, I change the FOV to 95.2, then 95, then 90, then 80, and NONE of these have changed the fov ingame.

I've made the My Documents\My Games folder non-read only, I've tried making changes to them outside their folder, but nothing seems to work.


I am running Windows 7 32bit OS