Did you obtain it from http://www.audacityteam.org/download/windows? Even if you did, I suggest you reinstall it and enable the “Reset Preferences” checkbox that appears half way through installation. When you launch Audacity, confirm that you want to reset preferences.
Assuming it’s a branded computer like Dell or Lenovo, the drivers for the built-in device are only up to date if you obtained them directly from the computer manufacturer.
If you upgraded to Windows 10 from previous Windows on the same machine, it would be very important that you went to the computer manufacturers’ site to check for Windows 10 drivers for your computer model.
Likewise if you have an external sound card like SoundBlaster, you must seek Windows 10 drivers for it, if available.