Sound not working XP bootcamp

Was running XP on OSx10 fine for a long time, i hadn't used windows for a few months, when i booted my computer in windows the sound wasn't working. I checked the silly stuff like making sure sound wasn't muted and stuff like that.

If anyone had this problem or has any ideas i would appreciate the feedback,
Thanks

I don't know the answer either, for a longtime my Built-in-iMac Mic was working, with Skype, then one day it was not. Bought a USB Logitec Mic, and have been using it ever since. I'm starting to suspect the Upgrades Apple sends us, may be to blame.

Try downloading and installing the latest realteK audio drivers again: http://www.realtek-driver.com/index.php

Then recently I did a new Windows7 bootcamp install.
http://www.mac-forums.com/forums/os-x-operating-system/242106-new-hdd-install-bootcamp.html
surprise surprise my again my Built-in-iMac Mic is working again.