I have been playing WoW recently and me and my friends have been chatting on yahoo. I just turned on my computer today and there was no volume. I am signed into msn and whenever someone signs into msn my comp makes a beep sound. I did some fiddiling around and now I can go into windows media player and listen to music also. I can't mute or turn the volume +/- on my keyboard either. I am at a loss and need help.
EDIT:Not related to the mic every few minutes all of my online contacts in msn quickly open and close.