Any of the following programs shall show you what's your motherboard
manufacturer and it's name:
3DMark (any version)
Aida32
Sandra
You'll also get a lot of other information about your computer, so I
recommend you to download at least Aida32. You can find all of these
programs at
http://www.download.com
When you find your motherboard name, go to manufacturer's website,
search for it, and you'll get information about integrated sound card.
Also, if there is unknown PCI Device detected, you have a PCI card
which is not installed! I can't imagine how can it be that you don't
know what you have inside your computer! So, open your case and check
for PCI cards!
Regards, Kolja
http://www.nixart.co.nr