Bootcamp partition/start up disk gone. How to recover

Hello,

I typically use Windows on my MacBook Pro. I recently re-started my MacBook with OS, then when I went to change back to Windows an error message came up. I can no longer start up in Windows.

I have a lot of data and programs installed on my Windows partition that I want to retain. In my Finder window, under Devices, I can see BOOTCAMP as a device (see screenshot). Luckily, when I click this device, it has ALL of my data, program files, windows files etc.

The question is, how to I set this up as a normal Bootcamp partition again that will work with start up disk AND not lose the data by doing so.

Thanks,

Nat