First, I would like to explain DOS, and then we will try to find the cause of your inability to boot from a floppy.
DOS = Disk Operating System
Almost all computers, up to and including mainframes, use a DOS. Among PC users, the term DOS has come to mean any of several operating systems available for PC type computers, primarily MS-DOS and those others compatible with it.
In the PC world, there has never been an operating system actually named just DOS, nor has there ever been an OS that I can find named PureDOS. I have been working with PCs since they first came out over 20 years ago, and I have never seen that term in any error message. In what message was that term used?
For the original PCs, made by IBM, there was PC-DOS, developed by Microsoft.
Later, as PC clones hit the market, Microsoft put out MS-DOS. It was virtually identical to PC-DOS except for some file names. Later there was DR-DOS (by Digital Research), FreeDOS (freedos.org), and others. These are all MS-DOS compliant, and any can be called DOS. They are all considered to be ?Pure? DOS, with MS-DOS possibly being the ?purest? because its pedigree traces directly back to the original.
The last of the free-standing versions of MS-DOS was MS-DOS 6.22. With the advent of Windows 95, Microsoft included many, but not all, of the DOS commands, and provided an entry to it under the name MSDOS Prompt. This became known as MS-DOS 7.0, but was not available outside of Windows.
In Windows ME, the real DOS was hidden, but it was still there if you knew how to access it. In Windows XP, there is nothing in this OS called DOS, or MSDOS. However, the file command.com, the core of DOS, is still there; and you access it from Command Prompt rather than from MSDOS Prompt. Many of the DOS functions still exist, but the way some operate has been changed, partly to accommodate the NTFS file system. For this reason, some do not consider this to be ?real DOS,? even though Windows itself is a DOS (disk operating system).
Please accept the fact that
DOS, or ?Real? DOS, or ?Pure? DOS = MSDOS, or PCDOS, or FreeDOS, et al.
Now, lets try to get to the bottom of your problem.
You can?t boot from a floppy. Is it just the Killdisk floppy, or can you not boot from any bootable floppy, such as the one you should have made from Windows when you first got it? If you cannot boot from any bootable floppy, your BIOS settings may not include floppies as bootable devices (perhaps setting the CD as a bootable device instead). Or, you may have a defective A drive. What message did you get when it wouldn?t boot?
If you can boot from other bootable floppies but not from the Killdisk floppy, then the latter must be defective. Two ways are provided to create a bootable Killdisk floppy. The first requires that you download a .zip file, and then extract killdisk.exe to a blank bootable floppy. The second requires you to download a .exe file and run it, specifying the target as a plain blank floppy. In either case, you must follow the directions exactly, as Bob pointed out earlier.
Since you mentioned a .zip download, I presume you were using the first of the two methods. This calls for a bootable floppy and, as people don?t usually have a stack of such lying around, you probably had to make it. How did you do this? Are you sure the system files got copied onto the floppy? Next, you had to extract the file killdisk.exe file from the zip file and add it, and only it, to the floppy. What program did you use to extract that file, and how did you put it on the floppy?
I made Killdisk floppies in both ways, and they both booted flawlessly. The one made with my bootable floppy naturally had MSDOS on it as that is the only DOS readily available to most people. On the one for which Killdisk created the boot sector, they installed a version of FreeDOS. This made absolutely no difference in bootability, as it shouldn?t have.
Please provide more details on exactly what was done and what messages you saw, then we may be able to diagnose the real problem.