lol, you have BI installed?, well if you unnistall RTW it will affect BI alright, you wont have BI anymore, make an RTW installation for this game then just copy the RTW directory to another directory and install BI later on the other RTW..for example i have 3 RTW´s in my pc, one for this RTW 1.5, other RTR mod and other SPQR mod...