Hi, my name is Neil, I'm an independent adviser and a Windows 10 user like you.
Sorry you're having this issue with your SD card not being read.
This sounds like your card reader has not got any drivers installed after upgrading to Windows 10.
To see if this is the case follow my instructions below:
Right Click on your Start button and then click on Device Manager.
In Device Manager, can you see anything highlighted with a yellow exclamation mark? If so, can you tell me what it is.
If not, click on the "View" menu and then click on "Show hidden devices". Does anything show up now?
If you can now see a device highlighted, Right Click on it and click on "Update driver"
Click on "Search automatically for drivers".
If it finds a driver and installs it, then that's great, but it might not be able to locate one.
Let me know what happens either way and let me know what the device is called.
Kindest regards,
Neil