Microphone No Audio Input Device Found

If you're saying that Device Properties shows Provider is Realtek, then you already have the driver installed. (The one driver is for the onboard audio speakers and microphone.

On the other hand, it wouldn't hurt to look in Program and Features look for Realtek and uninstall. Then download the driver from the support site and reinstall.

Otherwise, when you look at Control Panel->under Recording tab, do you see a mic listed? When you plug in the mic does it show detected? if not, it may the mic plug connection on the computer may have failed

I'll try reinstalling later if that's what causes the problem. On the Recording tab, it doesn't show the mic in the devices listed. I'm quite confused now because I've tried and tested that the mic works on the place where I bought it. Now it doesn't on my computer. Is it something external or does the pluggings are broken instead of the mic? Whenever I insert/remove something from it, it says that "you have plugged/unplugged a device from the audio jack". How do I fix that failed connection in the mic plug? Thanks.