Windows NT's Disk Administrator utility ù find it at Start-Programs-Administrative Tools (Common)-Disk Administrator ù enables you to convert a FAT partition to NTFS (or vice versa), but doing so erases the partition's contents. To convert from FAT to NTFS without destroying files, select Start-Run and type command. Then, at the prompt, type convert d: /fs:ntfs, where d: is the drive letter of the partition you want to convert. If you're trying to convert your C: drive, the conversion will take place the next time you boot.