To adjust the volume for multimedia recording devices
Open Sounds and Audio Devices in Control Panel.
On the Audio tab, under Sound recording, click Volume.
In the Recording Control dialog box, drag the Volume slider for the appropriate device up or down to increase or decrease the input volume.
To open Sounds and Audio Devices, click Start, click Control Panel, click Sounds, Speech, and Audio Devices, and then click Sounds and Audio Devices.
If you select the Place volume icon in the taskbar notification area check box on the Volume tab, and your sound card volume can be changed using software, a speaker icon appears in the notification area. You can change the volume by clicking the icon and adjusting the slider.