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Sometimes windows XP doesn't install the driver to recognize your USB ports. For example, a fresh install of XP does not contain any driver for sound or graphics. The best way is to update your windows XP up to Service Pack 3 by installing SP1 and SP2... etc, it will take a looooooooong time, but your PC would be better.
To check whether or not you have any USB drivers install just go to control panel and then device manager. Look for Universal Serial Bus (USB)
Is the account that your tying to access the drive with an Administrator account? If not, Log in as Administrator and try to access the new drive. If you ARE using Administrator privileges on the vista machine, the problem lies in the U3 smart driver. Try downloading and installing the drivers for the XP SP2 os on scan disks website, If vista rejects the install package off of the scan disk website, let me know and i'll extract the drivers and build an install for them for you.