setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
yacminer.exe --scrypt-chacha -o -u -p --worksize 128 -g 1 --lookup-gap 3 --buffer-size 2590 -R 7680 --temp-cutoff 85 --nfmin 4 --nfmax 30 --starttime 1388361600 --gpu-memclock 1500 --gpu-engine 1025 --no-submit-stale
Did you try these settings??
1. Reboot your system
2. Delete all .BIN files from your miner folder
3. Create .bat file with settings i gave above.
4. Wait till your miner starts, and post the results here