I have a dell Vostro 200 running Windows XP SP3 with a Realtek HD sound card. I am unable to get my mic working although it has previously worked on this computer. The mic is part of a headset which I have checked on another computer and is working fine. The sound comes through perfectly clearly. I have tried both front and back ports, the pink ports are correct according to graphics in Realtek Audio Manager. I have tried almost every mixer setting I could think of including having everything unmuted and volume turned up to max. I have been testing using Sound Recorder, Movie Maker, and Skype but dosen't seem to make any difference. I have downloaded and installed latest driver over top of old one. Realtek got me to send them a dump of sound card but have not got back to me. Anyone have any ideas or suggestions?