Desktop has no sound

I cannot get any sound from my desktop computer. My volume is maxed and drivers should be there but there is no sound. Help anyone?

Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit
Processor: Intel(R) Core(TM) i5 CPU 650 @ 3.20GHz, Intel64 Family 6 Model 37 Stepping 2
Processor Count: 4
RAM: 4023 Mb
Graphics Card: NVIDIA GeForce GT 320, 1024 Mb
Hard Drives: C: Total - 469881 MB, Free - 355886 MB; D: Total - 469885 MB, Free - 454746 MB;
Motherboard: Acer, Aspire X3950
Antivirus: Norton Internet Security, Disabled