I have just bought and installed COD4 on my second partition (D:\ drive). I am able to patch to 1.4 but when i run patch 1.5 it says it cannot find an installed version of COD4!! 
How do I tell it where to look or is there some other fix to get round this without having to install it on my OS (C:\ drive)
TIA

How do I tell it where to look or is there some other fix to get round this without having to install it on my OS (C:\ drive)

TIA