windows8 boot problem

Hello.
I own a toshiba satellite C50-A0113 laptop running windows 8 64bit. Ive had it for exactly two years a few days ago i restarted it and then when it starts it stops at the "Toshiba leading innovation" screen and then it says scanning and repairing drive C while on that screen it starts the process and then stops at 34%. that was two days ago now it just gets stuck on the "toshiba leading innovation screen " then after a few minutes it says preparing automatic repair. It then leaves that screen and goes to a black screen for a few minutes then flashes the blue screen written "your computer encountered a problem" then restarts. I tried creating a bootable windows 8 disc in order to repair but it doesnt even boot into the usb. I restart and press f12 in order to select the media to boot into. It checks the media goes to the toshiba screen then just goes black for some minutes untill it restarts. May i please know what is wrong and how can i possibly fix this because the problem is clearly not my hard drive. I removed it and put into another laptop and it was fine