I have installed Windows XP on a Asus mobo that has an onboard sound with Pentium 4. All of a sudden I lost the audio yesterday. I think that I have done something but I dont have any info about it. When checked on Device Manager, then I am getting an exclamation mark on the Multimedia Audio Controller and a Question Mark on the Ethernet controler. I have downloaded and tried to install the Audio Driver from Realtek. But it goes along until the warning, unsigned driver, that you wish to contiue. I then click yes and it continues for a second and then halts and then the pc crashes and restarts. Can anyone please help me out? Thanks.