I'm trying to get used to the feeling that I might never be able to recover my lost files. Meanwhile, I'll try to explain the situation, hoping that someone might suggest a solution:
My HDD is made up of two NTFS partitions: one primary with Windows 7 x64 on it, and a secondary used as storage for files. I no longer needed an OS on that drive, so I booted up Parted Magic OS, and deleted the primary partition. But after that, while exapanding the secondary to fill the unallocated space (moving the start point), my laptop powered off by itself! Damn!
Now, after booting in Parted Magic again, I opened my HDD and saw that some of the files were still there, but most of them were corrupt and some directories empty. However, it was showing that there were 200 gigs ot files, which was exactly how much data I had in the beginning. This single fact is keeping me hope that there might be a chance to recover my corrupted files.
Thanks for reading!