I own a pc with a P4M800CE-8237 MB. This is a MSI mb with VIA chips. Motherboard new in 2005. Phoenix bios LTD 6.00 PG 10/1 2.93 mhz clk Win XP SP2 OS 1024 mb ram ................................ onboard AC'97 Sound Codec chip: Realtek ALC655 "compliant with AC'97 wdm_a352 updated to WDM_A397 (22.214.171.12410)." Sound plays when CD or DVD installed. An email with a video clip plays video without sound. Presently using driver WDM_A397.exe, QUESTION: is this driver a compatible upgrade for the manuals recommended wdm_a352.exe? When I dbl-clk ControlPanels "Sound and Audio Devices" the Volume tab indicates "No Audio Device" and the Audio Tab reads "modem #0 Line Playback". This all looks wrong to me but CD's PLAY and the Device Manager for shows the Realtek AC'97 driver present. I'm stumped, I've reload WMP, downloaded recommended Codecs and still the CD's Play but video clips do not ! Any ideas?