Maybe you ost your hearing, can you hear other things, bang you knuckles on the desk.
Sorry, couldn't resist.
Go to the system manager! sorry does winme have that! if so remove sound card and reboot and let it autodetect the card.
If that doesn't work, well it just has to, thats all there is I have in my brain right now!!
If money was no object, how could you spend it!