Windows 7, audio problem

Hi, I installed Windows 7 today, but I'm no having any sound. The sound worked when i had XP, and i can't find out what sound card I have. My Mic doesn't work, and no kind of sound either. I have been in the DxDiag, but when I'm clicking on the sound tab, this message comes up:
No sound card was found. If one is expected, you should install a sound driver provided by the hardware manufacturer.
Here's a screen when I'm in the general:
htt p://i3 1.tinypic.com/i44v89.jpg (remove the spaces)
I've tried the Everest program, does this tell you anything?:
htt p://i3 2.tinypic.com/2n87t4j.jpg (remove the spaces)
I've been in the 'Other devices' in the Device manager. Multimedia Audio Controller, and Unknown Device is under the tab.

Please help, I'm so frustrated!
Thanks in advance,
Hexero -

This is a common problem... Have you run Windows Updates fully and completely? If you see "Windows is up to date" select "Check for updates, until there are no more available