I think you need to open Power Shell in administrator mode.
I use windows too :)
I wrote this tutorial focused more in Windows OS, with some steps which we used to start development. You can check the part "Install local node"
@samdevv , we have another tutorial explaining how to connect Geth to a local node:
And this can help too:
It is not directly related to the frontend because you you do it in a terminal.
The frontend uses web3 to do the communication with the node.
@roomsecrets , the best way is with a wallet mnemonic.
To choose a wallet:
To understand about address notation:
In this tutorial we did it using the wallet metamask connected to remix to compile and deploy smart contracts in testnet. It is a good start.