Hi, @TERRY WHARTON
Is this the built-in laptop camera or an external USB camera?
Does the red screen appear in the Windows Camera app and other apps such as Teams or Zoom?
First, check whether your laptop has a physical camera privacy shutter or camera switch. Make sure it is fully open.
Then go to Settings > Privacy & security > Camera and confirm that camera access is turned on.
You can also open Device Manager > Cameras, right-click the camera, and select Uninstall device. Restart the computer so Windows can reinstall the driver.
Please also share the make and model of the computer.