Hi,
You can also try to reinstall W8.1 by trying some of the no cost approaches out there in cyberspace, such as this...
Reinstall W8.1 by making your own plain W8.1 recovery media at the link below.
https://www.microsoft.com/en-us/software-download/windows8
The utility will allow you to make a bootable USB flash drive, or save an ISO file which you can later burn to a DVD using your DVD burning program's burn ISO file option.
After W8.1 installs, go to your notebook's support page to install the drivers and available software you need.
You may have to enter the W8.1 product key, if you use a USB flash drive option to install W8.1, see the link below for how to get past that issue...
https://www.pcsteps.com/627-install-windows-8-1-without-product-key/
Then you will need to know the product key in the BIOS.
I have zipped up and attached a free utility that will show you the windows product key in the BIOS.
You will need to be in windows to use the utility.
You can also try this generic W8.1 product key when you are asked to enter one at the beginning of the installation script, and if the key works you can skip the intermediate step above.
Windows 8.1 (Not Pro): 334NH-RXG76-64THK-C7CKG-D3VPT
Then after W8.1 is installed, change the product key to the one in your notebook's BIOS to activate Windows.