Windows Device Manager base system device under other devices
After installing or re-installing Microsoft Windows you may encounter one, two, three, or more base system device under the Windows Device Manager. This occurs when the drivers for the card reader on your laptop or computer is not properly installed. To correct this issue either locate the drivers on any drivers or software CD that came with the computer or visit the computer manufacturers website and locate the drivers for your computer card reader.
Many manufacturers will list these drivers under the removable media or chipset section.