There are many cameras and laptops that support SD but not SDHC. Exchange it for a 2GB card.
I have a 4GB SD card for my digital camera and when I insert it into the card reader on my laptop it doesn't even show up as being read. I know my card read works because it picks up my sisters card from her camera.
I am getting sick of having to whip out the cable and do it that way.
If anyone has any advice please share it.