https://nanopool.org/

Copy this in your start_xmr_pow7.bat :

GPU_FORCE_64BIT_PTR 1
GPU_MAX_HEAP_SIZE 100
GPU_USE_SYNC_OBJECTS 1
GPU_MAX_ALLOC_PERCENT 100
GPU_SINGLE_ALLOC_PERCENT 100
NsGpuCNMiner.exe -xpool stratum+ssl://xmr-eu1.nanopool.org:14433 -xwal YOUR_XMR_ADDRESS.YOUR_WORKER/YOUR_EMAIL -xpsw x -pow7 1