Sony Vaio Memory Stick not showing up...

I have a Sony Vaio that came with an internal memory stick reader. I don't
think I've ever used it, for that matter, I don't know what a memory stick
is or looks like, but since upgrading from XP Pro sp2 to Vista Ultimate last
week the memory stick "E Drive" no longer shows up and the rest of my drive
letters have shifted up by one letter.

I seem to remember that the driver was named Winbond, or something similar,
but I'm not entirely certain.

Does anyone know if that device is supposed to be recognized/supported under
Vista or not?

Thanks in advance,

Howard