You need to reset your Windows 8 operating system. Windows 8 has two options namely Refresh and Reset. The latter one removes all the user data and restores the system back to the factory settings. (Same as hard reset in mobile phones and tabs).
To reset your Windows 8 laptop, you need to restart your computer in safe mode. The link given below tells you how to do so:http://www.tomshardware.com/faq/id-1656470/safe-mode-windows.html
Once in safe mode, you can then Reset your computer without any issues. Make sure you back up your personal data before initiating the Reset.
Hope this helps.