On my computer I have a Delta Force Xtreme and a Delta Force Xtreme 2 folders under Program Files.
I noticed when I was doing the BO installed it wanted to install to the Delta Force Xtreme folder. So, I created a folder under the Novalogic folder under Program Files folder called DFX BO. I then copied all files from the Delta Force Xtreme folder, not the DFX2 folder, to the DFX BO folder I created and then installed the BO mod to that folder. Both programs work great.