It will store on C: usually but I think you mentioned you'd like them both on D: ?
I've set it to "D:\ArmoryDB" in the config file.

Great. I've made these .conf files for you to download:
https://gofile.io/?c=qu6xRt

You may need to manually create a new folder named "ArmoryDB" on D: (i.e at the same level as the Bitcoin folder).

• Open just Armory and go to File> Settings
• Make sure your settings look like this:
  
• Click Save and close Armory entirely - make sure ArmoryDB is not running in the background
• Type the following into your taskbar and hit return:

• This should open a window with your Armory wallet files and log files, but if you don't see that you can get there manually (some folders may be hidden by default):

• Copy the downloaded "armoryqt.conf" to this directory
• Navigate to D:\Bitcoin and rename the existing "bitcoin.conf" to "bitcoin.backup" (or anything else) and copy the downloaded "bitcoin.conf" here.
• Go to D:\. Make a new folder here called "ArmoryDB", just in case Armory doesn't create it
• If Bitcoin Core has been running, shut it down - you could restart the machine at this step, for good measure, if you want to make sure everything is shut down.
• Start Bitcoin Core again and wait for it load the blockchain i.e. let it get to the overview screen
• Keep Bitcoin Core running and start Armory.
• Cross your fingers

At this point Armory should start building from the correct and current blockchain. Will take a little while but there should be progress info in the Armory window.
If this doesn't do it, we really need to see your logs as has been suggested by bob123.