I don't know if this will help, but can you boot from any external Windows media? If you can, you might be able to run a check on the filesystem. To do this, you'll need a valid Windows install stick and to be able to boot to it. Plug the stick into a USB port and hold Option as you restart the Mac. If everything's in order, you'll see a graphical list of volumes. You want the one labeled "Windows" on a USB drive. Click the arrow below it, and quickly strike a key as the screen switches to Windows. If this is successful, you'll be in Windows Setup. Here, click "Repair your computer" at the bottom.
You might see s blue screen with a slew of buttons. Click "Advanced options", then "Command Prompt"
If your SSD has BitLocker, you'll need the long key sequence from your Microsoft account to open the volume for access (BitLocker is on by default under certain conditions).
At the Command Prompt, write:
chkdsk <x>: /f
where x is a letter from C onward that represents the Windows volume. Finding the actual letter is a little tricky. Let's say it's D, so you'd write:
chkdsk d: /f
Hit Return when you finish, and CHKDSK will examine and fix (that's our /F switch) the data structures on the volume. The time required is directly proportional to the amount of data that should be on the volume. You'll see some additional output for each problem found and fixed. Let it continue until the Command Prompt returns.
Restart your Mac and if it finds Windows, try to start it. If you can get to the Desktop, you're good to go. If not, you'll have to try other avenues, including redoing Boot Camp.
Nate
