Hi there Anita,
Looks like, in the upgrade from Windows 7 to 10, your SD card drivers have somehow gone AWOL, and are missing, hence the SD reader is not working.
If you reply with the make/model of your PC (laptop/desktop), then I'll be able to point you in the right direction for which drivers you need to install, which should resolve the issue.
EDIT/UPDATE:
Through a private message, I was informed that it was a Toshiba Satellite C655D, Serial number 5B122509Q. I checked Toshiba's website, it seems they don't offer Windows 10 driver downloads, and no SD card reader driver for Windows 8.1 either.
However, as this laptop uses a Realtek SD card reader, it should be possible to use the driver directly from Realtek - here...