My sound is working, but there is no sound

i have it set to realtek audio not optical but there is no sound have uninstalled and reinstall a few times frustrating
 

My Computer My Computer

At a glance

windows 7 64bitquad 3.3 i5 intelgeforce gts 250
Computer type
PC/Desktop
Computer Manufacturer/Model Number
asus p8h61-m
OS
windows 7 64bit
CPU
quad 3.3 i5 intel
Motherboard
asus p8h61-m
Graphics Card(s)
geforce gts 250
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