At the end of the day, your objective is a stable system... Forensics are fun ... if you have the time for it ... However you have been kicking against the stones for two weeks now without any success.. A clean reinstall is called for if you really want to get back up and running ... That being said, this whole situation could have been resolved in 20 minutes had you made an image of your system drive as a part of your backup policy ... Good luck with your problem.. 
http://www.sevenforums.com/tutorials/663-backup-complete-computer-create-image-backup.html?ltr=B

http://www.sevenforums.com/tutorials/663-backup-complete-computer-create-image-backup.html?ltr=B
My Computer
At a glance
64-bit Windows 8.1 ProCore(TM) i5 CPU 4330 Haswell @ 3.20GHz12.00 GBIntel(R) HD Graphics
- Computer type
- PC/Desktop
- Computer Manufacturer/Model Number
- LENOVO K450 @3.0GHZ
- OS
- 64-bit Windows 8.1 Pro
- CPU
- Core(TM) i5 CPU 4330 Haswell @ 3.20GHz
- Motherboard
- LENOVO
- Memory
- 12.00 GB
- Graphics Card(s)
- Intel(R) HD Graphics
- Sound Card
- Intel HD integtrated
- Monitor(s) Displays
- HP 25' ISP Monitor
- Screen Resolution
- 1900/1020
- Hard Drives
- (1) ST1000DM003-1CH162 (2) Generic STORAGE DEVICE USB Device (3) Generic STORAGE DEVICE USB Device
- Internet Speed
- 100mb down/10mb up