Hello, there is problem in audio driver....and when talking on skype or playing vlc player...volume is very low...
More aboutaudio problem
Update sound card drivers when the manufacturer releases a new version by downloading new drivers from the manufacter's website.
Depending on what you are using for an operating system, check to make sure all the sliders in the volume mixer are maxed out. If you are using XP or earlier, check to make sure that the "Wave" is maxed out as well as the main volume.