Start with the Sound heading, highlight the Realtek high def audio, then rightclick, if the machine is online, tell it to get the latest drivers and see if it can replace them automatically.

If it cannot replace automatically, head to the manufacturer's website for your computer, locate their support->drivers section, find the realtek sound driver .exe installer for your specific machine, download and run it to reinstall the sound drivers.

Then do a defrag of your hard drive as well.

And reboot the machine from cold, in other words turn it completely off and after waiting a couple of minutes, start it up again.


--Mac