Uninstall Hangs at 7% Complete from "Bloody" Virus (72890)

The information in this article applies to:
    Microsoft MS-DOS operating system 5.0
    Microsoft MS-DOS operating system 5.0a

This article was previously published under Q72890


The MS-DOS 5 Upgrade Setup program may hang at 7% complete if a virus is present on the computer. To work around this problem, boot from an original MS-DOS floppy disk.


This problem has been observed in two specific situations:
    Setup hangs if the Bloody virus is present on the hard drive. The Bloody virus installs itself in memory, infects the boot sector of a floppy disk and the partition table of the hard disk. After approximately 128 reboots, the virus displays the message "Bloody! Jun. 4,1989" during bootup. The message refers to the date of the Tiananmen Square massacre in Beijing, China.
    Setup hangs if the Stoned virus is present. The Stoned virus can corrupt system or overlay files, including *.COM files such as the COMMAND.COM.
In both situations, the solution is to boot from an original MS-DOS floppy disk, then run Setup again. Write-protect the original MS-DOS floppy disk so that it does not get infected with any viruses.

This work around may enable MS-DOS 5 Upgrade to complete the installation program. Use virus checking software as soon as possible to eliminate any potential viruses.

Modification Type: Major Last Reviewed: 9/30/2003
Keywords: KB72890