Originally Posted by lebellium
By hardware problem, I meant you probably broke the USB key of the U3 so it will never work again :/
I don't think you are correct that it is a hardware problem. My YP-U3 worked perfectly well (e.g - was recognized and correctly mounted when inserted in a usb port) on my Vista computer, then stopped working. I thought I had a hardware problem with the YP-U3, but that turned out to be wrong. Several other XP, not Vista computers work fine with the YP-U3. I still haven't figured out why it won't work on the Vista computer.
(later) This is silly, but shortly after posting, I found the solution on another forum, and it worked. Go to control panel->device manager. Look for Samsung YP-U3. I found it under Portable Devices. Right click, then click on uninstall. Remove the yp-u3. Plug it back in. Voila, windows installs the correct device driver!!!