I have a USB hard disk drive that I used previously with another back up software, but which I have reformatted. Windows XP Home recognizes the drive, to which I have assigned the drive letter F using the diskmgmt.msc tool. When I start Acronis True Image Workstation 9.1, I get the error message: "E100010F4: Acronis True Image Workstation has not found any hard disk drive. " Help!?