As goatpig has suggested, you might want to create your own thread and we can start afresh and see if we can't get Armory and Bitcoin Core up and running on your machine.
A completely fresh start on a fresh system would definitely be the easiest way, but should not be necessary. The trick is to take things one step at a time...
1. Get Bitcoin Core setup and running properly (This includes getting it setup and using any "custom" locations" that you want, which seems to be applicable in your situation)
2. Make sure that Bitcoin Core is fully synced. This is very important. Armory will likely do weird things until Bitcoin Core is fully synced.
3. Get Armory up and running (and setup using any "custom" locations) and talking correctly to Bitcoin Core.
Using Windows 10, Armory 0.96.5 and Bitcoin Core 0.21 it should be relatively easy to get it all going.