I got 2 ways to do it fast:
• Find the Windows Update program and download the newest updates for windows.
• You should go to find the new driver first, because it fix the problem 90% of the time.
To do this, you got to go find out what your model of the mic is called and then go to their website (Most of the hardware-makers put their drivers on their own website).
Download the newest possible driver for your device, to the desktop. Doubleclick it and it should pretty much install itself, if it doesn't need a little help (by an installationbox).
After you installed the driver, create a new folder (whereever you want it) and call it Drivers. then just put it there, after installation.
If you still got problems, please tell me what brand and model your mic is.