Actual Solution

Filter

VolumeLock
Trial version
VolumeLock: Take Control of Your PC's Audio Settings
Windows
Power Mixer
Trial version
Power Mixer: Advanced Audio Control for Windows
Windows
Power Mixer for Windows XP
Trial version
Power Mixer: Advanced Audio Control for Windows
Windows
VolumeLock for Windows XP
Free
VolumeLock: Control PC Volume Settings Reliably
Windows