Windows 10: Inaccessible Boot Device

I ran into a problem this evening with my laptop, Lenovo B575. The laptop kept restarting because of inaccessible boot_device. I am not sure how to fix this problem. I know it's too new for everyone with Windows 10. Mine is Windows 10 64X Home Premium operating system. Before that I had Windows 7 64X Home Premium and never went into WIndows 8 till free upgrade of Windows 10 two weeks ago. I don't think that I gave you enough information about this happened earlier today. I clicked the button " resetting the laptop. " After reset the laptop and got into this problem after restart the laptop. Here is the message I got from my laptop and look below:

Your PC (my laptop) ran into a problem and needs to restart. You can restart.

If you'd like to know more, you can search online later for this error: INACCESSIBLE BOOT_DEVICE.

I did try to restart the laptop but can't so I turn off the laptop and turn on again then ran into the same problem as above.
Any idea how to fix this problem otherwise I might have to take to computer repair place to get this fix.

Thank you,

John

:)

 

blue screen unacessible boot device--

I installed windows 10 and it now will not boot. It said inaccessible boot device and restarts itself and just keeps going back to inaccessible boot device

 

Inaccessible boot device

Date: Sun, 9 Aug 2015 14:19:33 +0100
Hi Santosh, I'm sorry but I'm lost already because I have 3 computesr ,the one I have that has the problem and had upgraded the win/10. 2.. one is running win/7 but the problem is the keyboard had coffee spilt on it and when it speeds up, if doing more
than one thing, it ends up going++++++++++++++ , so writing on to a dvd from it is problematic, and that's before the product key thing as I can not remember or even know where or if I can find each different one , I guess what I'm saying is that doing this
possibly beyond me as I have three computers two upgraded to win/10 ok, my other one is the one with the strange key strokes (I guess windows would have upgraded already as they did my other two (one which is now in the loop of trying to restart saying inaccessible
boot device) so is there another way of just putting a disc into my good win/10 and just copy on to disc the other one, and sort it out once I have access into computer, (I do have that reg key as it's underneath stuck to the base of my computer) Please
believe me I am pretty disabled in the reasoning and understanding front hence the mess with my computers, unless you know a more simpler way to do this, (I'm hoping you do) but please forgive this problem as it may just be unsurmountable, but I do hope
not as it is my main computer and cost me a lot and living on disability does not leave much over financially for me to solve it by throwing money at it(ah but to be bloody rich) I will await your response with trepidation best wishes Alex

Alexander MacDonald