Lately I've been starting Bitcoin Core and leaving it open.
Then starting Armory.

I also been having trouble getting Armory to download and stay in the D: drive which is where Core is.
I'll download Armory to the D: drive. Then when it starts and runs, I can look in the directories and Armory files are in the C: drive 

So I think you're onto something here.
I'll try you recommendation tomorrow>

"What you want to do is open Armory and go to File > Settings.
Is there a value in the "Bitcoin Home Dir" box and is it the same folder that you have Bitcoin Core set up to use on your hard drive?
If no to either, change it to the correct directory and close Armory. Make sure ArmoryDB.exe has closed too before restarting Armory"

As I'm out of time for today.

Thanks for the help thus far. It is very much appreciated.

I'll report back the results later.

Cheers,
Mark