If you follow this guide:
http://www.digitalcitizen.life/5-ways-boot-safe-mode-windows-8-windows-81?page=0%2C1 and use option '3' which is the first one on this page could you tell me what happens?
If you follow this and manage to get into safe mode then if you would please follow these steps:
1. Press "Windows + R" at the same time
2. Enter "control wuaucpl.cpl" (without speech marks) followed by enter
3. Windows Update should open
4. Select "Scan for Updates"
5. Install all updates including optional ones
6. Reboot and attempt to boot to the standard desktop
7. If this fails, follow the video again to get back into safe mode. If however, it works, then follow the first part of the video to get into safe mode.
8. Press "Windows + X" at the same time
9. Select “Command Prompt (Admin)”
10. Accept any User Account Control popup for “Windows Command Processor”
11. Enter "sfc /scannow" (without the speech marks) into Command Prompt followed by enter
12. Let the scan complete fully