For booting Windows on a UEFI-based computer, there must be an EFI System Partition (ESP) on the system disk. If you delete the EFI System Partition on the system disk by mistake or files stored on this partition are damaged or lost due to unknown reasons, the Windows OS will not be able to start successfully. If you have backed up this parition using EasyUEFI before, then you can use EasyUEFI to restore it, otherwise you need to recreate the EFI System Partition. Here you can find the solution about how to recreate the EFI System Partition (ESP).
Step 1. Run EasyUEFI as administrator, then click the 'Manage EFI System Partition' button.
Step 2. Click the 'Rebuild EFI System Partition' button.
Step 3. Select the destination disk in the drop-down list. If the destination disk is not correctly recognized by EasyUEFI, you need to click the 
button for the program to recognize the drive.
Step 4. Select the boot partition and system partition from the partition list, the selected partitions will be marked as red.
Step 5. Click the "Rebuild" button to rebuild the partition.
