I have Microsoft UAA Bus Driver for High Definition Audio as a system device without a driver. However, I don't know where to get an "official" driver for this "device". It just seems so generic. However, I noticed that when I had the video card in another machine, that machine required the same driver. Still, I've downloaded all possible video drivers and that device still needs a driver.EDIT 1: Formatted hard drive, installed XP with the bare essentials, then installed the card & drivers. still the same problem.ECS P4M800PRO-M478 (V1.0) Intel P4 Northwood 2.8 GHz 2x 512MB PC2-4200 DDR2-533 SDRAM Maxtor 120 GB SATA HDD Visiontek HD 3650 512 MB DDR2 AGP.Where can I find it?Microsoft UAA Bus Driver for High Definition Audio.EDIT 2: Installed the ATi HDMI Audio Driver after the UAA driver installation failed, due to XP being SP3 already. Now, the "Found New Hardware" dialog that pops up on start-up doesn't come up anymore, but in the Device Manager, I still get an (!) by Microsoft UAA Bus Driver for High Definition Audio . Hmph.Here are my specs first: