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About 3 weeks ago, I have accidentally used the "clean" command in diskpart in DOS.. And every thing in the hard drive was removed even the drive letters, it became unallocated space (465.8 GB).

I used a small part of that space (29.5 GB), to create a partition and install Win7 and kept the remaining part of the disk unformatted, to avoid any further precious data loss. I used "recover my files" to scan the hard drive, and fortunately it found most of my data, I also used "active file and partition recovery" which gave close results and saved the results of the scan for future use.

At the time I didn't have much space so I recovered what I can on another hard drive and kept most of the drive the same, unformatted in order to recover every thing later and kept using the (C) partition without touching the other partition which appears in "My computer" as (D) but inaccessible and unformatted (Raw).

Now I was able to clear some space, and I recovered a great deal of the data. I tried accessing the files but they didn't open. The documents appear to be corrupted, the rar files don't open so as the music mp3 files. Though there space appears accurate and even the music files show album information and stuff, they are useless..

I even rescanned the drive again using "recover my files" which gave similar good results but the files I recover are still inaccessible.. How do I get my files?? And what could have possibly happen different from my first recovery attempt??

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I suggest reformatting your question to make it easier for everyone to follow and understand. You have deleted your partition table, which is why the drive letters disappeared and your other partition is appearing in RAW format. What does it say when you try to open any of your recovered files? –  Hammo Dec 3 '12 at 2:49
    
For instance when I open an excel file it gives "The file you are trying to open is in different format than specified by the file extension. Verify that the file is not corrupted and from a trusted source before opening the file. Do you want to open the file now" and I get to choose from (yes/no/help). Ichoose yes, the sheet is completely empty, mp3 files don't open when I use jet audio it opens but it doesn't play. When I use wmp, it gives "windows media player encountered a problem while trying to open the file" and so on for the rest of the file types. I tried pdf files, movies, rar files. –  Ramy Dec 3 '12 at 3:01
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As you created that partition and installed Windows7 you rewrote data that was previously there. Unfortunately data isn't stored at hdd sequentialy, it's fragmented, so damaged wasn't only 30GB. That's the reason why files aren't readable, because parts are bad or missing. You may try another software (e.g. Recuva), results might be better, but you'll never get all your data back. –  week Dec 3 '12 at 3:17
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You really should not have touched the drive and installed anything on it until after you recovered as much data as possible - that's the most basic tenet of data recovery. Your biggest mistake was thinking you can install the OS and programs to a specific portion of the drive and keep all else unaffected, which just might have ruined all chances of data recovery. –  Karan Dec 3 '12 at 8:20
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No! Do not defrag, that'll only make it worse. –  Karan Dec 3 '12 at 15:07

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