Hello guys

I had install gOS 3 on my Sylvania gnet 13001 and the problem is the sound is really quiet and it wasn't that quiet when it was running xp so please could anybody help me and by the way can anybody tells me a good program for running flv avi and mp4 (I had vlc player but it only plays sound and because it's very quiet I believe even it doesn't play it) and YouTube downloader