Share your experience!
Hi rvwahw and welcome to the community,
The Base System Device will probably be the SD card reader writer. Assuming you are using the original Win 7 OS Try reinstalling the original driver from the Sony Support site.
http://www.sony.co.uk/support/en/content/cnt-dwnl/prd-comp/Preinstalled_Drivers_4776/VPCEB1E0E
Rich