Convert FAT32 to NTFS with out formating your harddisk
this is a simple nice command available in DOS commands. I had use this method in several occations with out any worries. You can convert your FAT32 hard disk to NTFS with out formating or with out damaging your data.
goto Run ---->type cmd(or any how get theh commant prompt)
type convert c: /FS:NTFS (this will convert your C: drive to NTFS)