Hi. I'm David, and I'm happy to help you.
Simply having a Windows ISO file on a USB flash drive isn't enough. You need to properly create a bootable Windows installation media on the USB flash drive. This allows your computer to boot from it and access recovery tools.
Below are instructions for creating installation media on a USB flash drive.
(You will need to create the installation media on a working Windows computer.)
- Access the link below and click "Download now" to download the Media Creation Tool;
https://www.microsoft.com/software-download/windows10
- Double-click on the downloaded file to run the tool;
- If prompted by UAC (User Account Control), click on "Yes";
- Read the terms and click "Accept" if you agree;
- Select "Create installation media (USB flash drive, DVD, or ISO file) for another PC" and click "Next";
- Uncheck the "Use the recommended options for this PC" box. Then, select the Language, Edition, and Architecture you want, and click "Next".
(Most computers use the "64-bit (x64)" Architecture.)
- Select "USB flash drive" and click "Next".
- Connect the USB flash drive you want to use, click the "Refresh drive list" link, select the USB flash drive, and click "Next";
(Note that the files on the USB flash drive will be deleted. Make a backup of the files if necessary.)
- Wait for the procedure to finish and click "Finish" when the USB flash drive is ready.
With the installation media in hand, enter the Recovery Environment as instructed below.
- Start your computer using the installation media;
(You may need to change the BOOT property in the device's BIOS settings.)
- Choose your language, select "Next", and click "Repair your computer".
In the Recovery Environment, I suggest checking if there's a restore point created before the issue occurred. Restore the system from that restore point and see if it starts correctly.
- On the Choose an option screen, select "Troubleshoot > Advanced options > System Restore" and follow the on-screen instructions.
If the problem persists or you have questions about one of the steps, please let me know.
Feel free to ask back any questions.