Over the course of time an external hard drive has become inaccessible when my laptop is running Win 7. The files on it were generated when my laptop was running XP. When I first installed the Win 7 drive I could see everything on the drive. I decided to move the files to a new external drive and that's when my troubles started. If I put the XP drive back in I can access the old external drive and see all the files. I can send files from the old drive to the new drive when my laptop is running XP and access them, but the files do not show on the new drive when the laptop is running Win 7. So I guess I have two problems, one for each external drive.