Maybe try mine, it's specialized in older hardware (CPU and GPU). I'm mining right now at 400+ h/s with my HD7850 2G
https://github.com/jceminer/cn_gpu_minerIt's almost getting annoying to read there's no decent CN miner for older hardware while my topic is on the exact same channel as this one and online for something like 6 months...
I have tried but my rigs are all in windows 7 and your miner is incompatible

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Maybe is time to a OS upgrade or a GPU upgrade ...