Here are three Claymore configurations I have tried and tested, all work fine. Which one I use depends on how I'm feeling at the time, and if I think one pool is working better than the other pool.
setx GPU_FORCE_64BIT_PTR 1
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_SINGLE_ALLOC_PERCENT 100
setx GPU_MAX_ALLOC_PERCENT 100
NsGpuCNMiner -xpool stratum+ssl://Pool.XTL.CryptoPool.Space:9000 -xwal -xpsw X -pow7 1
setx GPU_FORCE_64BIT_PTR 1
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_SINGLE_ALLOC_PERCENT 100
setx GPU_MAX_ALLOC_PERCENT 100
NsGpuCNMiner -xpool stratum+tcp://communitypool.stellite.cash:6699 -xwal -xpsw X -pow7 1
setx GPU_FORCE_64BIT_PTR 1
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_SINGLE_ALLOC_PERCENT 100
setx GPU_MAX_ALLOC_PERCENT 100
NsGpuCNMiner -xpool stratum+ssl://communitypool.stellite.cash:6600 -xwal -xpsw X -pow7 1