Microphone input is all static after windows update. How to fix?

[Pierre O.]

Before I ran into the latest update, my microphone input was all well and good. I have been using it for class. But then after a specific update, my microphone's input is all static; like a very thin signal-like noise. I go on to the mic and speak "mic check" but all it picks up is a very high-pitched frequency. I tried using different microphones, but it turns out the PC is the problem. I tried using the microphones to other computers. The speaker is fine. There hasn't been any significant damage to the computer as well. Please help. How to fix?

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