I remove by mistake the realtek audio device high definition audio bus. Now, the sound of my computer is not working. What should I do?

Hi! 
I remove by mistake the realtek audio device high definition audio bus. Now, the sound of my computer is not working. What should I do?

first go to start-all programs- windows update is at the top of the list follow the prmpts to install microsoft update which is the new version of windows update if microsoft update is all ready installed go there and select custom then let it look for updates
then if it detects missing drivers it will install or guide you on what to do. If you have an r52 laptop then try this link.
http://support.lenovo.com/en_CA/downloads/detail.page?LegacyDocID=MIGR-58599 the best of luck.
2 if that doesnt work then try this  open device manager right click on the sound device you may have to expand sound, video and game controlers on the tab that comes up select properties then select the drivers tab  select update driver.   
do it this way incase the driver installation failed the frist time it may not ask you to update again if you didnt uncheck the box that came up on frist try.
3.find a mother board disk and search the disk using explore for ac97 realtech driver. actually windows update should solve it also try there  FIX IT web site there are many automatied fixes there for your use.

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