missing volume panel no mixer i hit volume and it says go to add hardware to add audi

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows XP Professional, Service Pack 3, 32 bit
Processor: Intel(R) Pentium(R) 4 CPU 3.00GHz, x86 Family 15 Model 2 Stepping 9
Processor Count: 2
RAM: 2046 Mb
Graphics Card: NVIDIA GeForce FX 5200 (Dell), 128 Mb
Hard Drives: C: Total - 76285 MB, Free - 19597 MB; F: Total - 476937 MB, Free - 461259 MB;
Motherboard: Dell Computer Corp., 0W2562
Antivirus: AVG AntiVirus Free Edition 2013, Updated: Yes, On-Demand Scanner: Enabled