No, I don't have an external reader, it's built in. I have a laptop. But I'm thinking about buying one. The one from my laptop is Ricoh..
I also noticed another problem. When connecting the camera (I use the 4 GBs for my Digital Camera), I notice I can't copy files (movies) more than 1,5 GB... so, it's not only the card reader. It may be from Vista also.. The card is Kingston, I don't think it has a problem..