The prompt means "A signature error occurred." It may be a problem with the digital signature, depending on what kind of machine you have. My supplement from Earth: there has been a signature failure. There is a problem with the MBR (master boot record) of the hard disk that has failed to sign. You can hang the current hard disk on another computer to rewrite the MBR. Of course, that computer must have the DiskGenius software installed. This method can usually rescue your hard drive. The key is that the data in the original hard drive can be saved. If you can't find another computer, you can just find a hard drive, install it on your own computer as the main drive, use the hard drive in question as the secondary drive, and rewrite the MBR. If you can't find it and you don't know how to do it, the simple way is to use DM Delete the hard drive or replace it with a new one. The lessons this incident teaches you are: 1. Save important data on your computer at any time (you can save it on another hard drive, optical disk, U disk, mobile hard drive or even a network hard drive). 2. Your computer must have dual hard drives. , even if it is a small hard drive of several G, as long as it can accommodate XP. The advantages of dual hard drives are: first, it can be used as a dual-disk dual system. If one is broken, just boot the other hard drive in the BIOS, so that the computer will not be paralyzed; second, important data can be placed in the backup disk.