Accidentally uninstalled realtek audio NO SOUND!

To free space on my computer, I accidentally uninstalled Realtek audio from programs and features, thinking that it was not important and now there's a little x around the sound icon with "no Audio output device is installed". I tried methods such as having the windows to solve the problem and go to Device Manager. I also tried to go into the system restore and only save point showed which was after the time where I've uninstalled it.

My PC has Windows 7 Home Basic Edition
Service Pack 1
And it says on the hp pavilion a605x system unit. I think it's the model?
Ask for more information if you need? Help, please!

This model, according to the website of HP came with Windows XP pre-installed, not win7

http://h10025.www1.HP.com/ewfrf/wc/softwareCategory?OS=228&LC=en&cc=us&DLC=en&sw_lang=&product=424352

Tags: Windows

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