Hi, I am having trouble with the sound on my computer, as in I have none! The computer type is an Acer Aspire T180. I used to have sound and then suddenly one day I didn't and I'm not sure how I lost it. But when I went into the system I had an error message saying that I did not have the correct software to install 'Audio Device on High Definition Audio Bus' with a yellow exclamation mark. I came on here and saw that I needed to download the correct drive, so I went to the Acer website and downloaded the Audio Drive, which in turn downloaded 'Realtek HD Audio Manager.' When I went back to the system the 'Audio Device on High Definition Audio Bus' has gone. I have tried all possible solutions on Windows help but nothing! Please help! I have been trying to solve this problem for hours and am ready to give up! Any suggestions?