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Hello!Thank you for your question. I am Shefin and I look forward to helping you with your issue today.
Please try following the instructions in the link below.
Video : https://www.youtube.com/watch?v=6FRmPtHwynA
If the issue persists, or you have any questions, please be back and let me know.If you appreciate my service, please rate it EXCELLENT by clicking the EXCELLENT (5 Stars) and Submit. My goal is to provide you with excellent service – if you feel you have gotten anything less, please reply back, I am happy to address follow-up questions. Thank you for your business!Thank you!S H E F I N
Or try the below link : http://www.pcadvisor.co.uk/how-to/windows/how-downgrade-windows-10-to-windows-7-8-easy-3615606/
S H E F I N