Each video with audio has an audio button. Please click and make sure the volume setting is as high as possible. You may also need to check the audio settings on your computer. Generally speaking you should be able to click the speaker icon in your system tray to access settings.

When watching videos you may need to adjust your audio settings.

Windows 7 & Windows Vista Users: (Using Windows XP? Scroll down the page)

At the bottom right hand of your screen on the tool bar you will see a speaker icon.

Click on the icon to open the volume control.

Move the bar up to increase the volume.
To increase the volume in a particular task, click on Mixer. This will open up the Volume Mixer which will give you options to adjust the volume in different programs.

For Windows XP Users:

At the bottom right hand of your screen on the tool bar you will see a speaker icon.

Click on the icon and move the bar up to increase the volume.
To open the volume menu, right click on the icon. Open Volume Control.

You can adjust the master volume accordingly.