Where can I find the audio driver for the Asus VG248QE?

Go to the Asus web site and download the Realtec driver for your model of the Asus. It's also possible you have the driver on your computer but don't have the audio working correctly. You can troubleshoot the audio yourself were you to find thd folder for it. Go to the start menu and type the word speakers and then click on the it when it comes up and look to see if all the functions are set correctly. I have the feeling this is an internal problem with your computer.

www.asus.com/support
is a good starting point