I have now figured out  what components there r in the Dimension 8100 Desktop.

Here with (More Filter Option) Inside Dell Dimension 8100 and have downloaded the drivers accordingly.

Now both sound and video is workin properly, im confused about the VideoCard inside tho, i have installed the 64MB DDR GeForce3, but i have also downloaded the pack with the 32MB Geforce2 MX inside... when i got to Device Manager i manualy updated it and chose the Dell fil on the PC where all the different vid. card drivers were... so it must found the right one but i have no clue which one it was :S

Now when i go into EVEREST under DirectX Video it sais i have a 32MB nVidia GeForce2 MX (Dell)

So it must have been the one installed from all the different drivers... 

THX :)