Hi Newcomer,Welcome to the Tom's hardware forum.
You want audio drivers software/ sound card hardware?
As you posed in Drivers section, here is the way to get drivers,http://support.acer.com/drivers_download.aspx
Go to this link, select Netbooks> Aspire1>Select your Model>Select the appropriate OS (if option available) Download & Install the drivers
If you want Sound Card, go to nearest Retail Store & buy it!