Hi, Just few days ago I upgraded my laptop from windows vista to windows 7 ultimate 32 bit. Everything works fine except audio. When I plugged the headphone it sounds, but without headphones I cannot hear any sound from my laptop.I followed these steps: List any Problem devices Make sure devices are connected and powered on Click Start->Run, enter: msinfo32. Click the + sign next to Components to expand it Click Problem Devices. Anything appear? and my problem devices are listed out. Base System DevicePCI\VEN_1180&DEV_0592&SUBSYS_01F31028&REV_12\4&20402523&0&0BF0 THE DRIVERS FOR THIS DEVICE NOT INSTALLED. please help me. Thanks in advance.