Audio for my Compaq Presario CQ42-263tu

How can I benefit the features of Dolby for my Compaq Presario CQ42-263tu? Is it possible to have it installed in my PC. If not, are there any softwares that improves the audio quality of my PC (aside from the audio driver in my laptop)? 

OK...
Now we have to get creative! 
Download and install the free 7-Zip utility.
http://7-zip.en.softonic.com/
Download this driver:
http://h20000.www2.hp.com/bizsupport/TechSupport/S​oftwareDescription.jsp?lang=en&cc=US&swItem=ob-317​...
Decompress driver audio Conexant CX20468-31 AC97 and Equalizer with the 7-Zip software.
Once installed, do a right click on the file sp30578.exe, select 7-Zip/extract the files and then click OK.
Force the installation of the driver manually:
In the device manager, right click on the audio controller, and select Update driver.
Select install from a list or specific location Do not search. I will choose the driver to install.
Click on next, Have Disk, and browse.
Select the cpl3085a.inf file in the uncompressed folder sp30578, and then click Open.
Click on OK, next and finish.
Restart the computer.
Paul

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