After upgrading my Pavilion dv7t-7000 from Windows 7 to Windows 10 the SD card reader (Realtek PCIe Media Card Reader) stopped working. After a fair amount of research I found a solution right here in the community in the archived topic "SD Card not reading" originally posted on 02-20-2016. The solution that worked for me was posted to that thread by @Paul_Tikkanen (Thanks Paul!). He supplied an ftp link to a driver for the Realtek PCIe Media Card Reader for a newer HP notebook. I did a little more research and discovered that a newer driver superseded that one a couple of weeks after his post, so I downloaded that driver and installed it. My SD card reader works now!