I recently did an in-place upgrade of my Windows XP 32bit to Windows Vista and my secondary 750GB partition on my 3TB drive is no longer accessible. In Disk Manager I see it as an unallocated partition. I've tried reinstalling the GPT Loader but I receive the message "Ultra-capacity hard drive is already correctly recognized by your operating system. Additional driver installation is not required." and am forced to close out. For testing purposes I further upgraded the OS to Windows 7, but the same issue occurs. The main 2TB partition on the drive works perfectly fine. I know the data and the drive structure is perfectly fine on the secondary partition, because before I upgrade I made a Ghost copy of the OS drive (A separate 64GB drive) and if I put back in the Ghosted un-upgraded OS drive I have full access to the partition. Is there any way to force GPT Loader to install in Vista or Windows 7 so I can get access to this partition or some other trick to get it to recognize the partition.