A little bit of share.
I use the win10 for better hardware support
1. Install new win10. use the update function of the win 10 to update all the hardware. Then restart the computer
2. Install Driver Booster 3, the software driver updates online

Link Down http://www.iobit.com/en/driver-booster.php

Then use 38A24-42DC3-6BF6B-70CB3 Serial Driver update Booster 3 Pro

Scan driver and update all new drivers, then reboot the computer.

I use 1 r9 270x card.

My command line. Work effectively with me.

EthDcrMiner64.exe -epool eth-sg.dwarfpool.com:8008 -ewal YOUR_WALLET/YOUR_WORKER -epsw x -dpool stratum + tcp: //dcr.maxminers.net: 7777 -dwal  Weblogin.WorkerName -dpsw WorkerPassword -esm 0 -dcri 50 -ethi 25 -dcrt 15 -r 180 -allpools 1 -allcoins -1

You should use 2 commands -ethi 25 -dcrt 15 , it make effective ETH