secuono

I have a Gateway Tablet PC, and I did the System Restore it has build it(I was having major issues with slowness, not shutting down and freezing even though virus protection said I was fine.) So I did the restore and everything else is working wonderfully, except the volume. There is no toolbar icon to change it and in the 'start, control panel, sounds speech and audio devices, sounds and audio devices' everything is grayed out, I cannot change anything exept the tab 'sounds' sound scheme. It is set to windows default now, before it was blank. But this has not helped any. I have tried to go to the Device manager and change/update, but no luck. Everything says the drivers are working, but when I click 'advanced volume controls' a beep from the PC itself(not the speakers) goes off then a pop-up says "there are no active mixer devices available. to install mixer devices, go to Control Panel, click Printers and other hardware, and then click add hardware." That does not work. What is the real problem and how do I fix it? Sound used to work just fine before I did they restore. Please help! I've read other articles and they have gotten me know where, so please don't tell me to read those instead.