BIOS stands for Basic Input Output System. Essentially, it's a little chip in your PC that tells it how to boot up. The very moment you switch the PC on it will display the BIOS output (scanning memory, detecting hard disks etc) or a splash screen (usually the manufacturers logo). At this point, pressing a key (usually Del or F2) will allow you to configure the BIOS, within which may be a setting to enable the camera.
Since the camera has worked before, it certainly sounds like you've disabled it in some way sha[e or form. Other than that, you start getting into obscurities such as a Windows Update breaking the drivers and all sorts of other stuff.
Dave
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