No problem ktotko, just download AND install the AUDIO drivers.However I do not find a SR1758nx model.There is a SR1750nx model, and a SR1755 model.Could it be that the 0 or 5 looks like an 8?[ Drivers are small pieces of software, that allow the Operating System to 'communicate' with a device.Windows XP, Windows Vista, and Windows 7, are a few examples of an O/S. Operating System.The audio chipset on the Compaq Presario's motherboard, is an example of a device.People often download the drivers they need, but fail to realize that the drivers need to be INSTALLED also. Otherwise the driver files just sit in a folder, and are NOT installed ]Compaq Presario SR1750nx, main support page,
http://h10025.www1.hp.com/ewfrf/wc/product?product=1815877&lc=en&cc=us&dlc=en&lang=en&cc=usIn the list left-click on - Software and Driver Downloads. (In blue)Takes you to the page, where you choose what Operating System you are using.Click on the blue down arrow, to the right of the box, that has - Select - in it. In the drop down list click on Windows XP. (Doesn't matter if it's Home Edition, or Pro Edition)In the list click on the + sign to the left of -Driver - Original (4)Under the blue heading -Spring 2006 Original Realtek AC'97 Audio Drivers,,click on - More infoCompaq Presario SR1755nx, main support page,
http://h10025.www1.hp.com/ewfrf/wc/product?product=1818062&lc=en&cc=us&dlc=en&lang=en&cc=usClicking on - Software and Driver Downloads - in the list, brings you to the page where you choose what Operating System you are using.Windows XP,
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?os=228&lc=en&cc=us&dlc=en&sw_lang=&product=1818062In the list, left-click on the + sign to the left of -Driver - Original (4)Spring 2006 Original Realtek High Definition Audio DriversClick on - More info. (In blue under the above file name )The audio driver files need to be DOWNLOADED AND INSTALLED.Post back with the exact model number of the Compaq Presario, and I will lead you step by step in downloading, and installing.Can't make out what the last number is?(SR1750 or SR1755)Suggest you use the free Belarc Advisor,
http://www.belarc.com/free_download.htmlPost back in a Comment.Regards,joecoolvette