microphone problems uhhh

[Mark]

I got realtek HD audo manager

Usually after you plug your microphone in a pop-up screen appears from Realtek confirming that your microphone is plugged in and ready for use. Have you seen this pop-up screen every time you plug your microphone in? Also Twilight maybe right too, I never used Skype but perhaps there is an option which allows you to set input device. Try searching in the options, maybe you'll find something.