[ubuntu] change ntfs file system type

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http://ubuntuforums.org – Hi, I have a dual boot system. I have a ntfs file system, on which my window7 is installed. I am not been able to access it either through live ubuntu or installed ubuntu system, and I also cannot boot into windows. I want to know, if I run the live ubuntu, and from gParted, if I change the file system to ntfs or any other type, is it going to delete all my data on that partition or not? I just want to access my data from my windows. plz help. (Hardware)