Everything works fine, except for the sound - there is none. The device manager tells me all is fine; there are no yellow question marks or exclamation marks. But under Control Panel/Sounds and Audio Devices and then the Volume tab, everything is greyed out.
If I try to play a sound in the Sounds tab I get the message "Windows cannot playe the sound %SystemRoot%.... Your sound card may be in use."
Although Device Manager shows you all is fine I suggest you uninstall the sound driver which is showing there - then reboot - windows should then pick up the driver that you have downloaded and install.