I have a Dell Printer 926 for 3 years now with no problems, using it with two OS (Xp and 7)
I tried to put an SD card into the slot reader (it has card reader bulit into it)
I normally use this is card in my digtal camrea, and just use it with a USB cable. Works just fine that way.
So, i have not used the SD card slot at all with Windows 7, up until now. I was using this printer with Windows Xp, until i upgraded to Windows 7. The printer card slot worked fine under Windows Xp.
Since i have installed Windows 7, i have not used it.
The printer works fine for everything else.
Any suggestions to try?