Solved No sound after installing Vista Service Pack 2

I recently installed Vista Service Pack 2, but then the sound is gone. I try to turn up the volume on my taskbar to no avail. It's not muted, my monitor isn't muted, does anyone know what the problem might be?

I haven't messed around with any connections from the monitor to the CPU.
 

My Computer

System One

  • Manufacturer/Model
    Dell Inspiron 530
    Monitor(s) Displays
    Acer
    Screen Resolution
    1920x1080
    Keyboard
    Dell/Logitech
    Mouse
    Dell USB Mouse, Logitech Wireless Mouse or Windows Optical
    Other Info
    Thank you for everything you've done for me in the past years. I'm sorry that games require much more than you're capable of, but you'll never be forgotten as my first personal computer <3
Most likely the Driver
Go to search by the start button, type device manager. Any drivers with small yellow markers must be udated. If no yellow markers update your audio driver.
 

My Computer

System One

  • Manufacturer/Model
    Dell XPS420
    Memory
    6 gig
    Graphics Card(s)
    ATI Radeon HD3650 256 MB
    Sound Card
    Intergrated 7.1 Channel Audio
    Monitor(s) Displays
    Dell SP2009W 20 inch Flat Panel w Webcam
    Hard Drives
    640 gb
    Cooling
    Fan
    Keyboard
    Dell USB
    Mouse
    Dell USB 4 button optical
    Other Info
    DSL provided by ATT
Thanks alot, rich! Downloaded Realtek HD Audio Driver and things are now good as new :)

Scales clicked.
 

My Computer

System One

  • Manufacturer/Model
    Dell Inspiron 530
    Monitor(s) Displays
    Acer
    Screen Resolution
    1920x1080
    Keyboard
    Dell/Logitech
    Mouse
    Dell USB Mouse, Logitech Wireless Mouse or Windows Optical
    Other Info
    Thank you for everything you've done for me in the past years. I'm sorry that games require much more than you're capable of, but you'll never be forgotten as my first personal computer <3
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