I do not have cod4 anymore , but could you copy the head part of moss log :
SHAS mode started at 2015-01-30 23:28:12 for COD BO II
ping:39ms
update 6
DirectX version is 11.0( )
OS is 6.1 64 bit
version: MOSS 2,4,3,0
and check you have a complete directx installation by http://www.microsoft.com/en-us/download/details.aspx?id=35 , and recent video drivers