CF Card failure - a bit different

I recently, about a week ago, purchased a SanDisk Ultra 4 GB card. the photos I took today are recorded on the card but when I try to transfer them via card reader to my pc, on Picasa/MyPhoto Gallery, they are not recognized. I do not have the cable to transfer them directly from the camera, therefr, am unable to access them.  I used the same setup to transfer photos yesterday from a different brand of card  and it worked perfectly!

Cards are not cheap and that is a poor example for their publicity! I always thought SanDisk was supposed to be a top brand!