Leiding

I'm sorry if this is the wrong forum, I wasn't really sure where to put it. I figured this would be my best bet, since the hardware works with my old XP computer, and the problem hasn't always been around.

I've got Vista, with SP2 installed. I used to use a microphone on this computer for online gaming and things, but lately I've found that it no longer works. I've looked all over the internet, and haven't really been able to find anything that helps. I've tried messing around in the sound panel a bit, and unfortunately I must've screwed something up last time - now I can't get any sound to come OUT of my computer either. I know neither of the issues are with my mic/speakers themselves either, since I've tried different mics and headphones/speakers. Any suggestions?