well, my old pc had the same issue, when i turned off the sound there was no lagg at all... sound on and it starts lagging again, it has the same soundcard.. also a Realtek i dont get it... i even bought a new monitor mouse, and keyboard. and still nothing changed.
so i think maybe the installation program has this problem. try to download the game from another source and see if it happens again!!
What do you mean another source? sorry, im not that good with computers.
if you have bought the gave dvd, change your installation dvd,
i think, to this end its the problem with your installation
its not the same card from my old pc, this is a newer one, and i downloaded the game on steam
oh and btw, its not only that game :S
since you have onboard sound on your Mobo, I would disable the sound card and see if it still happens with the onboard sound. It might be that the sound card and graphics card are having a conflict when sending data through the PCI channel.
Edit: Either disable sound card in the Device Manager, or physically remove it from the computer and test it.
also petko's suggestion is excellent, reinsert the card to make sure the connection to the PCI slot is correct.
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