First open your device Manager and uninstall your audio driver and reboot.
Type devmgmt.msc in your run box this will open device manager find your audio device right click it then uninstall. Reboot your machine.



Try this program to get an update for your audio driver.

http://www.innovative-sol.com/drivermax/

You need to register the program in the link above and you get two free drivers in a 24 hour period.
Make sure and uncheck the highlighted boxes when installing drivermax.



Also take a look at the links below.
Tips for fixing common sound problems

http://windows.microsoft.com/en-us/w...und-in-windows

If the above fails then Download UnknownDeviceIdentifierand post the log it Creates in your next reply.
Run the program allow it to finish then hit file> save > Save the file to desktop.The default file name will be DeviceList Attach Device list in your next reply.






Hit start button at lower left hand corner of the screen.Then in the run box type services.msc. Look for windows audio/anything to do with audio and make sure the startup type is set to automatic. To do this,right click selected service select properties then change the startup type to automatic then left click apply.You will need to reboot your machine for the changes to take effect.




Please download the windows all in one repair tool.
http://files2.majorgeeks.com/files/...one/tweaking.com_windows_repair_aio_setup.exe
Make sure all the settings are the same in the screen shots That I have uploaded for you. Make sure and back up your registry also create a restore point.This is standard for any registry adjustments.




The Screen Shot below are the settings which need to be ticked prior to running this tool.




Make sure when you run this tool that it is the only thing that you run close everything including your browser for best chance of this program doing its job.When done the program should automatically reboot your machine if not then please do so.

Marked as solved,glad it was a simple fix for you.