HP Pavilion dv5224nr: Installed Windows 7, now there are no audio devices installed

I just installed windows 7*64 on my 4 year old laptop.  (I used to have windows XP).  I have not have sound since I did this.  I have noticed that for other users they just needed the right driver, however, none of these work.  I don't know if this helps but when I go to Sound in the Control Panel, I do not have any audio devices.  
Can anyone help?

Hi,
Go to  
Control Panel -> Devices Manager -> Audio, Video and Games Controllers 
Find Your audio card there and click on it with right button of Your mouse and choose properties. Then go to ' Details ' tab and paste here Hardware Ids .
Below You've got example how to do it:
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