Recover data from deleted partition during installation of fedora 18?

I was installing Fedora 18 and Windows XP was already installed on my primary C drive. one of my partitions deleted accidentally during installation which contained backup data. The file system was NFTS. I used EASEUS data recovery. It took too much of time and all of the files were not recovered ( or I was unable to recognize them.) I had some important flv files but they didn't recover. Please tell me some free software you may have used which may efficiently recovered the data.