Toshiba Laptop getting errors due to win 8.

My Toshiba Laptop which I bought last year is working perfectly fine. And I really like it. But since yesterday, it just suddenly stops on booting. I tried to recover it but it just throws an error message, 'unable to find tib_mounter.sys'. I'm running Windows 8 and I want to know how I can recover it so it will work properly again. Please help me.
