This should be easy to fix. You will need either some kind of Windows Install media or a bootable Windows Recovery Disc/USB. The recovery disc/usb can be created on any Windows box.
Boot into the recovery disc / or install media and select
Troubleshoot
Next click on
Advanced Options
Now
Command Prompt
Select your user
Enter your password and click continue
Now type
diskpart (1), then
list disk (2) here you will need to ID which is your Windows disk, I have multiple disks in this example. Then type
select disk # (3). Next list the partitions with
list part (4). Your BCD store should be on the small 300MB to 500MB (5)
Now you need to select that partition with
select part # (6). Now assign it a letter, I picked s,
assign letter=s (7),
list vol shows us the partitions and we can verify S is the system reserved or EPS in a UEFI setup (8). Now type
exit
Now type
bcdedit /store s:\boot\bcd /enum (9) you can see under Windows Boot Manager that {default} is our default boot entry and that it is pointing to the EasyBCD Linux entry
Now we want to set the Windows Boot Loader as the default you will need to change the identifier to match your entry
Now listing the store again we see that Windows Boot Loader is the default
Reboot and you're done.