Look up fix master boot record MBR for windows 10 or repair EFI bootloader. You will need a usb drive with Windows 10. You could also try the auto repair in advanced options.
https://www.partitionwizard.com/partitionmanager/windows-mbr-fix.html
for EFI bootloader and GPT - https://www.dell.com/support/kbdoc/en-ca/000124331/how-to-repair-the-efi-bootloader-on-a-gpt-hdd-for-windows-7-8-8-1-and-10-on-your-dell-pc