For Windows XP, operation may not be normal because Microsoft has ended support for this operating system. (Reference)

In the Windows Control Panel, click Sounds and Audio Devices.

The Sounds and Audio Devices Properties window will appear. Click the Advanced button.

The Volume Control window will appear. Click Options - Properties from the menu.

When the Properties window appears, select the Recording radio button, check the Microphone Volume checkbox, and then click OK.

A new window will appear as shown below. Check the Select checkbox under Microphone Volume.

After closing the window, go back to Control Panel - Sounds and Audio Devices - Advanced, then click Options from the menu.

Then, this time, click the Playback radio button, check the Microphone Volume checkbox, and click OK.

Under Microphone Volume, clear the Mute checkbox.