Well, I've been a tech support for toshiba laptop, so you need to press and hold 0 (zero) button on your keyboard while restarting your laptop. Then after you the windows logo, it will go directly to system recovery screen. You just need to follow the step or hit next, next, next. then it will reload your OS, sometimes it takes 30-45 mins, it actually depends on your computer. If you see the same error message while doing the system recovery. I suggest to call the manufacturer of that laptop and use your warranty to fix that.
This process is useful but every laptop has secret buttons for accessing recovery screen. Here's the list
Toshiba – Press and hold ’0′ key.
Dell – Press F8 or Ctrl+F11
Acer – Press Alt+F10
Compaq – Press F11
BenQ – Alt+F10
Asus – F9
Sony Vaio – Alt+F10
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