@Claymore First, I want to thank you for your great software. Second, I wanna know what is your opinion about miner not working on Win7 with Blockchain drivers? Is it a problem with drivers or in miner?
Try the procedure for installing the leaked unofficial driver fix. By robinh00d (
https://bitcointalk.org/index.php?topic=2068446.0). It worked for me. If not, just upgrade to win10

Thank you for suggestion. It's working!