Call of duty 4 modern warfare problem

[Mr.Fedo]

thx alot I missed u too :P
I'll tell everything helpful :
1) My pc spec's : Celeron(R) D CPU 3.07 GHz, 3 GB of RAM, 512 MB NVIDIA GeForce 7300 GT
2) The game runs great and fast, and it will be perfect without this problem
3) When the person/object goes black/dark you cannot see any details on it, you will only see a black person, grass, door, etc ... without details as i said before.
but I have an idea, what if I downloaded the latest version of directx? will the problem be solved??