It seems I need new drivers for my multimedia audio controller. I have no sound, my sound-card is on-board. What should I do. Where can I find the drivers for this device?

You should be able to find them at your motherboard manufacturer's web site.

Thank you very much, ScottGem, but I fixed the problem by using "system restore", thus reinstalling the driver I had accidentally removed. Thank you again.

That was another possibility