If there is no sound for the captured video in Windows XP, it's usually the "Stereo Mix" setting problem.
Depending on the setting of the user's system, the audio cannot be recorded (or volume of the recorded sound is too low).
In such case, the following adjustment in the setting needs to be made for the user's system.
1. Select the 'Open volume control' option in the system tray and run the 'Volume control' window.
If there is no 'Open volume control' option in the system tray, you can run the 'Volume control' window by clicking Window start > Setting > Control panel > Sound and audio devices.
2. Select the 'Properties' from the 'Volume control' window.
3. Select the 'Recording' icon from the 'Properties' window, and then check the 'Stereo Mix' button.
If there is no "Stereo Mix' option, you can check 'Wake output mix', 'What U hear, 'Stereo out', 'Mixed output', 'Post-mix', 'Loop back', 'SUM' and the like.
If you can't check "Recording" icon, you should change the "Mixer device" at the top of the 'Properties' (number 1)
4. If there is the 'Mute" check-box instead of the 'Select' check-box, the box needs to be unchecked.
5. If you set the stereo mix setting properly, you may see the sound bar when recording.
1) If you still can't record the sound, change the sound device of Bandicam
2) Do not choose 'USB sound card' or 'USB headset' in Windows XP. If you use Windows 7/Vista, you can record computer sounds with the USB headset/sound device. However, If you use Windows XP, you can't record computer sounds with the USB headset/sound device.