I would like to run a CPU miner on a Windows 8.1 machine.  I am finding the GPU ccminer and sgminer.  I am running the Groestlcoin Core Wallet, Qt 5.7.1 .
I am new to this so gracious guidance would be appreciated.  My GRS Core Wallet is constantly synching with the latest block from the Blockchain. 
Currently 1821213.