From microsoft forums:
Perform online repair on your Windows is the best solution on this.
On this process we will re install your Windows without touching your files and programs that is installed on your computer.
Kindly access this link to get the ISO file of Windows:
You do not have permission to view the full content of this post.
Log in or register now.
Click download tool now.
Once the media creation tool is downloaded kindly click on Run or double click the icon.
Click Yes or Okay if it will prompt your a UAC box.
It will automatically run the process.
Accept License term agreement
Choose Create Installation media (USB flash drive, DVD or ISO) for another PC.
Click on Next.
On the language screen check if it is correct, if not kindly uncheck the box to edit.
Click on Next
On the next window it will ask you " choose which media to use"
Instead on creating a bootable media choose or click "ISO file".
Click on Next.
Choose where to save the ISO file.
Once the file is saved kindly double click on it and run the ISO file and run the setup.exe and follow the on screen instruction.
Kindly look on this link as well for the process of online repair or inplace upgrade on your Windows:
You do not have permission to view the full content of this post.
Log in or register now.
Note: it will take some time to download and install. Kindly not interrupt the process to make it work.