I would use Macrium Reflect to image your hard drive. If not that do a clean instal,l win 7 images are easy to get same with Win 8.1 Update 1 ISO.
I would not clean disk until after you have reassembled and know your pasting it good to go and everything else. after testing if all is good then do a clean install and reinstall all your software and games.
there have been others here that have actually repasted I would search these threads and get advice from them on doing the actual repasting it's not quite as straight forward as a desktop is. Has to do with pads and stuff I don't know since I haven't actually done this.
Good Luck and be very careful and cautious
G752VY-DH72 Win 10 Pro
512 GB M.2 Samsung 960 Pro
1 TB Samsung 850 pro 2.5 format
980m GTX 4 GB
32GB DDR 4 Standard RAM
Z97 PRO WiFi I7 4790K
Windows 10 Pro
Z97 -A
Windows 10 Pro