audio mixer device problem

Hello Major Geeks
The master volume of my mixer does not work- I cant raise or lower the volume of any player except windows media player. The wave control works alright but the master seems to be set at a certain point. it moves but does not affect the sound volume

Everest report

Computer:
Operating System Microsoft Windows XP Professional
OS Service Pack -
DirectX 4.09.00.0902 (DirectX 9.0b)
Computer Name E-7C0VDHBOR69B8
User Name l

Motherboard:
CPU Type Intel Pentium 4, 2533 MHz (19 x 133)
Motherboard Name Dell OptiPlex GX260
Motherboard Chipset Intel Brookdale-G i845G
System Memory 512 MB (PC2700 DDR SDRAM)
BIOS Type Phoenix (02/26/03)
Communication Port Communications Port (COM1)
Communication Port ECP Printer Port (LPT1)

Display:
Video Adapter Intel(R) 82845G/GL/GE/PE/GV Graphics Controller (64 MB)
3D Accelerator Intel Extreme Graphics
Monitor Plug and Play Monitor [NoDB] (KC13963J6HCM)

Multimedia:
Audio Adapter Intel 82801DB ICH4 - AC'97 Audio Controller [A-1]

Storage:
IDE Controller Standard Dual Channel PCI IDE Controller
Disk Drive WDC WD800BB-00DKA0 (74 GB, IDE)
Optical Drive HL-DT-ST CD-ROM GCR-8481B (48x CD-ROM)
Optical Drive HL-DT-ST DVD-RAM GH22NP20
SMART Hard Disks Status OK

Partitions:
C: (FAT32) 76297 MB (72369 MB free)

Input:
Keyboard Standard 101/102-Key or Microsoft Natural PS/2 Keyboard
Mouse Microsoft USB Wheel Mouse Optical

Network:
Network Adapter Intel(R) PRO/1000 MT Network Connection

Peripherals:
Printer Microsoft Office Document Image Writer
USB1 Controller Intel 82801DB ICH4 - USB Controller [A-1]
USB1 Controller Intel 82801DB ICH4 - USB Controller [A-1]
USB1 Controller Intel 82801DB ICH4 - USB Controller [A-1]
USB2 Controller Intel 82801DB ICH4 - Enhanced USB2 Controller [A-1]
USB Device Microsoft USB Wheel Mouse Optical