Cases of 'it worked fine before until today' are often related to something that has updated in Windows and broken the camera functionality, perhaps by altering the configuration of the USB ports. So downgrading your Windows version to one in which the camera previously worked would be a good first thing to try..
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I recently had this issue and resolved it. I first downloaded the latest F200 RealSense camera drivers, but was presented with a message indicating that the installer did not recognize a RealSense camera attached, even though it was connected and showed up in my Windows 10 device manager under both Cameras and Imaging devices. I tried several things, including uninstalling the drivers via Device Manager, unplugging the camera, re-plugging the camera, rebooting, etc.
But what did work in the end was opening Windows 10 Devices and Printers control panel ... Select Settings (Windows Settings gear from windows logo), select Devices. Then on right-hand side, under Related Settings, select "Devices and printers".
In the control panel window that opens, you should see your "Intel(R) RealSense(TM) 3D Camera (Front F200) displayed under a camera icon under the "Devices (xx)" section. Right click it and select "Remove Device". This will remove and uninstall all device drivers associated with the camera. (I think this is the key ... simply removing drivers from the Device Manager doesn't get all of the removed ... there's one hiding under Universal Serial Bus devices for example.
Then unplug the camera from your USB 3 port. Wait a few seconds, then plug it back in.
When Windows detects your camera after plugging it back in, it'll re-install the drivers properly. In Device Manager, open Imaging devices. You should see "Intel(R) RealSense(TM) 3D Camera Virtual Driver" listed. This is what went missing when my F200 stopped working ... and broke Windows Hello.
Now the camera should be working again, and if you install the latest Intel drivers for it, the installer should recognize the camera as present. In my case, it indicated that the latest drivers were already installed ... by giving me Modify or Remove options, but not an Install option. So I didn't have to do anything but cancel the driver install.
Hope this helps anyone who's F200 camera mysteriously stopped working. I think mine stopped after a recent Windows 10 update.