To change from FAT 32 to NTFS for more stability and security, open the command prompt (In the start menu) and type: "Convert C: /FS:NTFS". Make sure there is a space between the C: and the foward slash (/). Once you press enter it will ask you for confirmation and press Y. Then press Y and enter once more to reboot. You will need to defrag afterward, it will take while the first time you do it.