Partition Recovery NT File System keeps a backup copy of the boot sector on the last sector of the partition which can allow recovery programs to restore it. So you have been hit by CIH - tough luck - let's see if we can help you out of there. First of all, boot your PC with a system disk. If the PC was using FAT-32, you should boot from a Win 95 OSR 2 or Win 98 installation disk. Norton Utilities' recovery disks are ideally suited to the task. We'll assume you have them, or if you choose to use another disk editor, I'll assume that you know what you do. The FAT is also called the boot sector, and resides on the first sector of the partition. The difference is that FAT does not keep a backup copy of this information, and the recovery of data becomes complicated.