What do you need help with, Realtek (sound) or SD card (removable media)
For the SD card go to Card Reader Driver 5.1.2600.2011.zip - Free software downloads and software reviews - CNET Download.com
Download the driver to your desktop
Go to device manager and uninstall the driver that is there
Reinstall the driver, When it asks if you would like to go on line or browse your computer say browse. Go to the file you downloaded from the download I sent you to.
For a Realtek problem go to the Realtek driver site (link on top of sound threads) and do the same thing
If I have helped click the scales symbol and tell me