Had BCD file error, now fixed, but the Laptop is slow still

This is a friends laptop, a Toshiba Satellite Pro C660-28R but I can't resolve the problem. 

He had a completely locked down laptop with the missing BCD file error and a blue screen. He doesn't have a windows recovery disc/usb. I downloaded a new Windows 10 to usb and managed to get it to repair, partially, enough to boot back into Windows 10. Unfortunately, it's still not running well. mouse click response is between 5 & 10 secs.

I'm trying to repair without him buying a new copy of Windows 10. There is also another issue. Out of frustration I decided to install a copy of Ubuntu Mate (dual Boot). The laptop won't boot from USb or from the DVD, have tried both after changing the boot order. The Ubuntu welcome screen shows then the PC shuts down. 

the only reason I mention this is because I suspect that's what will happen if he does try and install a new copy of windows. Any thoughts?

Also, once booted, I've tried to run the automatic repair but it never completes.  I've left it running up to 2 days.   I can't make a recovery disk either.

Dave

I would suggest doing a Refresh using installation media.  The instructions below explain where and how to download a ISO image of your version of Windows 10 and create the installation media for either a DVD or flash drive.  Since you will be running the Refresh from the installation media you shouldn't experience the problems you were having.

How to perform a Windows 10 Refresh from Installation Media

A Refresh will basically reinstall Windows 10.  This will not effect your personal files, but it will uninstall any third party programs you installed.  You will be offered a list of the programs which will be uninstalled, you can use this list as a reference to these programs.

To do a Refresh on a computer which can not boot you will need Windosw 10 Installation Media.

If you don't have installation media you can use the Windows 10 Media Creation Tool to create installation media for either a disc or flash drive.  Follow the instruction for the second option Using the tool to create installation media (USB flash drive, DVD, or ISO file) to install Windows 10 on a different PC.

In order to use either form of installation media you need to change the boot order in the BIOS so that the type of media (disc or USB flash drive) is the first device in the boot order, and the ssd/hdd the second device.

If you are using a disc place it in the tray of your optical drive, close the door and restart the computer.  When the computer recognizes the disc it will instruct you to press any button to boot from the disc.

If you are using a USB flash drive place it in a USB port and restart the computer.  You will receive the message to press any key to boot from the device.

There is a very good tutorial available, you will find it here.

I did try this but it's possible I got confused repair and refresh.  I'll try again.  Many thanks