please try this link,click download on the menu of the page.
drop down box will appear and click
SoundTap Streaming Audio Recorder.
http://www.nch.com.au/
save it & install.you will be prompt with screen that the driver
is not signed by microsoft
(which already appeared in your dxdiag : WHQL Logo'd: n/a)
click continue during installation.
the dxdiag error is your device id (sound chip).not being
detected.
if the driver didnt worked,download & install everest on the link below
http://www.majorgeeks.com/download4181.html
run the program,save & attach the report on your next post.
EDIT : you may want to check the MEDION link below,
you just need to key in your mainboard's S/N #
DOWNLOAD LIBRARY>MORE
at the left side of the window click MEDION PRODUCTS
DOWNLOADS>DRIVERS & MANUALS
& hit search to download the driver pack.
http://www.medionusa.com/