PI0109120605 Installing on USB device, USB Install program does not see my USB Drive
For safety reasons, certain drive letters will not be checked for a USB device. Using Disk Management (In Windows XP, the easiest way to get to this is: Control Panel | Administrative Tools | Computer Management, then select Disk Management), you can change the Drive Letter to a H: or K: or other drive letter, and then re-run the USB install. You must have the USB device installed, and it must be visible as a drive in the Computer view of Windows Explorer.