Driver for smartcard reader (E6400)

Dear forum members,

I am a computer novice but I think I'm not dumb, so I have a concrete question about a driver for my Latitude E 6400.

There is a built-in smartcard reader (not the SD-cardreader) in this laptop, and I looked for a driver without any result. The reader is marked in the system with a exclamation mark, when it is activated by inserting a smart card in the slot, and the system tries to find a driver, but doesn't find any. So the reader does not work. Can anybody help me finding the correct driver for the reader?

Thanks a lot

Jürgen