Noob: new to bitcoin, bitcoind will not run on Windows 10
You can run bitcoind.exe on windows if you leave off the -daemon flag, as the error message says. Then it will run in the command prompt window or whatever you are running it with. While it's running, you can interact with it using bitcoin-cli.exe in a separate command prompt window.

No, you can't run bitcoind and bitcoin-qt at the same time if they're using the same data/wallet directory, correct. But that's not the cause of the error here.