Why does my pc make beeping noises from the back randomly?

[Microsoft Windows]

Another 2-3 days ago, my pc just started to randomly make annoying beeping noises. These beeps can go from 1 to 16 and can occur at any time. I’ve never had any problem this annoying or like this in any way and cannot find a fix online so this is my last resort. I haven’t changed anything with the pc at any time to cause the beeping although I am aware my C drive has extremely low storage and my antivirus ran out about a week or two before the beeps started to happen.Hoping someone can help me out here

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