HI Everybody

Yesterday when I try to use NTFS undelete software to undelete a picture from my trashbin, it says my C drive is a non-NTFS drive !? What had happened ? In fact all the drives on my computer had suddenly become non-NTFS ! I have used the undelete programme last months to recover a pictures too and it works fine then. What happened ? I am usung Window XP window at home. I have scan my computer with ESET NOD4 antivirus and it is clean. I am lost ? Please help.

best regards