I backed up the hard drive of my old computer (8yr old Gateway running Windows XP) onto a Passport external HD. When I open it on the new computer (HP Pavillion running Windows 7) explorer shows there are files, but it says they are empty. If I open it at work (3yr old Dell running Windows Vista) the files open just fine. How can I get my new computer to recognize the files so I can transfer them and get rid of the old computer. Currently I have to run both to access what I need.