Missing Bootcamp after resize / Missing operating system

Hey

I stupidly resized my partition on disk utility and now I've lost access to bootcamp. Using guides on here I managed to get boot screen to show windows. however, when it starts to boot up a black screen saying 'missing operating system' comes up

Any help / guidance on this would be greatly appreciated!

I'm not great with using terminal / gdisk but here's some info that might help.