Thanks... when checking your third alternative ...
Finally, Start > Control Panel > Sounds And Audio > Audio (tab) > Sound
playback , shows the sound card in use to play the default windows sounds.
I find;
"Realtek High Definition Audio rear output" is to play the default windows
sounds, but is this a sound card?
On the hardware-tab I find:
_NEC DVD_RW ND-3500AG (DVD-player - not sound card)
ATI WDM Specialized MVD Codec (according to the hardware tab; located on
RADEON X600 PRO graphic card)
ATI WDM Rage Theater Video (according to the hardware tab; located on RADEON
X600 PRO graphic card)
Realtek High Definition Audio (according to the hardware tab; location 65535
(Internal Definition Audio Bus)) ... does this mean that there is only a
"motherboard integrated sound card"?