Hi again Armando Actually my mind is a bit boggled at the moment, I have been sitting here all night trying to fathom out what is wrong or what could possibly cause this problem - to no avail. Hi Sandy ... this is probably too simple, but I had it happen to me a few weeks ago. I had actually started to download some pictures from my camera when it stopped with some sort of error message about the USB connection. I left the camera plugged in and went to Device Manager and sure enough .. it had the yellow exclamation mark on the USB root hub. I unplugged it, rebooted and it reinstalled the driver, but the same thing happened when I plugged the camera in again. If I unplugged the camera it was fine. I ended up simply moving the plug to another USB jack (I went from the back of the computer to the front) and had no further troubles. I assume there was a problem in that one jack. Anyway, I have not had a problem since so thought I would mention that in case you haven't tried that yet. If you used the same cord at work as at home, that would eliminate any possibility of the cord being damaged. Good Luck!! Howard