Make sure you check if the audio device or the audio jack isn't broken. Make sure that there are no problems during installation and open Device manager, check for the sound driver and make sure it's not disabled (you must to enable it).
That thing has a Realtek 2 channel ALC260 so the newest realtek hd driver from the realtek site should have worked.
Are you getting the message in the bottom right by the clock where the speaker is that no speakers are plugged in? If so you can try going into the bios and either turning off the system speaker, or if is off turn it on. Those computers have a built in media speaker that always worked great in xp but vista and 7 dont like.