|You may need to set the mic volume where you don't normally see it, or lessen or disable a mic boost feature. |
See Response 6 in this
" Make sure you don't have volumes set too low or muted, for things you want to hear or use.... "
(in your case, make sure you don't have volumes set too high)
With a mic plugged in, click on Recording Devices, then double click on the microphone, then click on the Levels tab
Also see Response 5 starting at....
"A frequent answer of mine regarding sound software problems ....."