Hi,
Thank you for contacting Microsoft Community.
I appreciate your time and effort.
I would suggest you to go through the below methods:
Method 1: Safe mode starts Windows with a minimal set of drivers and services.
http://windows.microsoft.com/en-in/windows-8/windows-startup-settings-safe-mode
Method 2: Perform Clean Boot
Placing your system in Clean Boot state helps in identifying if any third party applications or startup items are causing the issue. You need to follow the steps from the article mentioned below to perform a Clean Boot.
How to perform a clean boot in Windows
https://support.microsoft.com/en-us/kb/929135
Note: Refer "How to reset the computer to start normally after clean boot troubleshooting" to reset the computer to start as normal after troubleshooting.
Method 3: Try to refer to section "How to manually replace a corrupted system file with a known good copy of the file" from this article.
https://support.microsoft.com/en-us/kb/929833
Method 4: Try to uninstall and re-install driver:
http://windows.microsoft.com/en-us/windows-8/all-drivers
Method 5: Run safety scanner:
https://www.microsoft.com/security/scanner/en-in/default.aspx
Note: Any data files that are infected may only be cleaned by deleting the file entirely, which means there is a potential for data loss.
Please let us know the results. Feel free to write us back for any further assistance with Windows, we’ll be glad to assist you.