You don't install Drums of War in Logic..
Assuming the version you have of Drums of War is a Kontakt Library (If not or if you are using the older K2 version.. update DoW to v1.5 which is K4 compatible and works better in K5) then you either add it to your Kontakt Library within Kontakt using the Add Library button or if it doesn't alow you to do that.. becaue DoW is not set up to be a full library... you simply use the File Browser inside of Kontakt to find and then load it... Read the instructions that came with DoW for more info...
Additional Note: Running Logic Pro 9 in 32bit mode only allows Logic to access/use the first 4GB of your onboard memory...
You can run Logic in 64bit mode so Logic Pro 9, as well as any 64bit plugins you are using... can access all 8GB of your onboard memory ..or you can keep Logic Pro 9 in 32bit mode..and turn on Kontakt's memory server (See Kontakt's own Preferences) to allow only Kontakt to access that extra memory.
Personally I'd run Logic in 64bit mode but if you are using a lot of the older 32bit AU Plugins then Logic would be forced to use it's 32bit to 64bit bridge which is a bit unstable.
Important: If you do activate Kontakt's Memory Server.. remember to turn it off again, should you run Logic in 64bit mode in the future as if you don't werid things can happen! In other words don't run Logic in 64bit mode and have Kontakt's Memory Server on at the same time.