Rome:total war and BI

Can I delete Rome total war and still keep Bi?

Im trying to download Medal of Honour Allied assault, but I have this bug where it shows me this menu that says Modify,repair,uninstall. None of them help me install it, and iv did it before.My freind says its a corrupted file, but I cant permantly delete the remaining small files, and I looked at tech support. It could be that im low on virtual memory, and Rome total war takes up 2.5k MB.

You can delete certain files manually(files not needed for BI, like the Egyptian skins), but the game engine; which I assume takes up most of the HD space; is needed for BI.

Do of course take back up of the files if you`re going to delete them manually; I can`t guarantee that it works.