When I upgraded from Win 7 to Win 8 the SD Card Reader on my Dell Latitude E5430 stopped working. It does not even appear in Windows Explorer. I installed all drivers on the Dell site. does anyone know what I can do?
Have you check the Device Manager for Errors?
See Step 12 of A Clean install of Windows 8 in my Windows Reinstallation Guide:
Windows FAQs and OEM Downloads