I have a HP laptop G60 437CA with a built in webcam & mic on top of the monitor, just recently installed Windows7 Ultimate. Noticed problem when I tried contacting a friend for MSN Messenger Video Chat... I could see them and hear them fine on the messenger window they can also see me BUT they CAN NOT HEAR ME!
Did all the possible troubleshooting to check if the mic is connected or muted... I never had this mic problem when I had Vista