Download Zap.Zip
Use WinZip to open.
There are 3 files in this zip file. You're reading one of them.

The purpose of the other two (ZAP.SCR and ZAP.BAT) is to wipe a hard disk clean of any evidence (or remnants) of Boot Sector Viruses (viri?) or Drive overlays. It does this by removing the Boot Sector. The actions in ZAP.SCR came from somewhere on Toshiba's WebSite. I turned it into a debug script and wrote ZAP.BAT

This may not zap the second physical hard drive on the machine, however, I wouldn't suggest doing this procedure on a box that has data you can't afford to lose. In cases where multiple hard disks are present, you might want to zap each drive separately as the primary hard disk.

The use of these files WILL cause data loss!
REALIZE THIS. Use it at your own risk!!!!!
I will not be responsible for any damage to you or your machine, directly or indirectly resulting from your use, abuse or misuse of these files!!!!!
Instructions:

Do this on a virus free machine.

Put ZAP.SCR and ZAP.BAT on a DOS boot disk that has DEBUG.EXE FDISK.EXE & FORMAT.EXE on it. Write protect this disk.
I prefer to use a Win98 Emergency Boot Disk created from either the Control Panel or by running WINDOWS\COMMAND\BOOTDISK.BAT because it will see darn near any CDROM on the market these days. If you can boot from the CD to install the OS, you won't need to worry about seeing the CD after booting from a floppy.
Boot up the afflicted machine with this disk. From this point forward, I'll assume you're using the Windows 98 BootDisk.

I usually boot up with CDROM support, if only to make sure that my disk will see the CD drive. You won't need the CD for this boot, but it's comforting to know that you'll be able to see it 2 boots from this when you'll really need it. (While you may still have drivers to see it in DOS mode.)

Remember, you'll have to re-install the operating system.

Now that you've checked that you can not only see the CD, but can also read it (do a DIR on the CD drive), type ZAP at your A:\> prompt.
You'll get one chance to back out - ANY key other than CTRL-C (or CTRL-BREAK) will completely WIPE your drive.
If you're using a Win98 BootDisk, the machine will reboot automatically.
If you're not using a Win98 BootDisk or if REBOOT.COM is not present, you will see
Bad command or file name
at the bottom of your screen. If you see that, the drive is still wiped, just give it a CTRL-ALT-DELETE. You must reboot for this to work properly
You now have a blank hard drive. I warned you about this earlier.
You can use the same bootdisk to create your partition(s), format the drive and install the operating system.