I wonder if the letter is now overlapping another. Try changing it.
2. What SD CARD? I find SDHC cards to fail like this widely. But the cure varies wildly.
I own a Dell Dimension XPS420 with Vista. I have been using a Kingston USB 2.0 Hi-Speed 19-in-1 Reader. Although all the drives appear in My Computer, I am unable to see the presence nor content of an SD card. I tried the reader in another PC and it reads fine, so I suspect some problem on my Dell. I plugged in USB headphones into the same USB connector on my XPS420 - they worked! I tried plugging the card reader into a rear USB connector and it still will not me see SD card, although I see the drives. I suspect that there is something wrong with the USB configuration - but have no idea. Of the usb devices in device manager, they are all enabled, but not sure how many I should see.
I am at a loss. Help?