I recently went to a thrift store and purchased an HP Pavilion d4100e without a hard drive. I added one I had lying around, formatted it, and installed Windows XP Professional x64. I installed my graphics card driver just fine, but I have no audio and the USB ports on the front of the machine do not work. I went to the add new hardware wizard and there are three unknown devices; SM Bus controller, Multimedia Audio Controller, and Unknown Device. I've searched everywhere and I'm 99% sure it's a driver issue, but I cannot find drivers for these three things anywhere! I honestly don't expect to find the one for "unknown device" because of how vague the name is, but I would like my audio and front USB ports working. Any help is appreceated. thanks.