My computer runs with 3 hard drive connected by SATA, one has my old operating system on it (windows vista), one with my current operating system (windows 7) and the other has all my programs and files on it. It has been running fine for over half a year, yesturday we had a power cut while the computer was turned on, when I turned the computer on again later that day I was having trouble running windows related operations and not all programs started up, I realsied that my program drive letter had changed from (E) to (F) I tried to change this back useing windows but the file path could not be found. My DVD drive also connected by SATA has taken drive (E). I tried to boot up without the DVD drive connected but still the program drive was (F). When I boot up my old operating system windows vista everything is ok and my porgram drive is (E) again. Can you help me?