Thats the thing it's a different installation, as the game originated from another region (India) but is still valid for worldwide game play, just that I can't install it. The basic BF2 is installed in G: directory where I want this to install, but as there isn't an option, - i.e. nothing grayed out or any drop down boxes I don't want to risk installing it on my c drive. When I go to install it asks:
"Automatic or Custom installation" choosing custom, you can only change the components you want installed, and at the bottom it just say xxgb on c drive (remaining etc).
At least it means I can play on BF2 for the time being tho it would be good to mess around with the expansion packs as well