I am having two IBM laptops. The first one is Lenovo T42 & the second one is Lenovo T60. I had formatted both the system and installed fresh drivers from the official website. I got a message on the screen saying The HDA Audio bus driver is required and not found. I am getting this common error on both. This simply means the audio is not working. I tried to run Windows Update but there was some issue with that also. How can I make this work. Thanks.