No audio volume icon in tray

Right click in Task bar, click properties, under notification tab tick volume.HTH.
Have you checked in device manager? If you see any yellow triangle sign, you may have to install the drivers.
You could try a system restore and this seems to be the easiest method.
 

My Computer

System One

  • Manufacturer/Model
    Biostar
    CPU
    AMD Athlonx64 Dual Core 3800+ 2.0GHz
    Motherboard
    Biostar MCP6P-M2
    Memory
    4GB
    Graphics Card(s)
    NVIDIA GeForce 8400GS
    Monitor(s) Displays
    CIBOX
    Screen Resolution
    1280x800
    Hard Drives
    Hitachi 160GB
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