MS-DOS 6.2 Step-Up Fails with McAfee V-Scan (110406)
The information in this article applies to:
• Microsoft MS-DOS operating system 6.2
This article was previously published under Q110406
MS-DOS 6.2 Step-Up may generate one of the following messages and fail if
you try to run it on a system on which the McAfee V-Scan Checksum option
/ag or /av has been used:
In order to run the MS-DOS 6.2 single-disk upgrade, you must already
have MS-DOS 6.0 installed on your system.
Cannot Update File. Setup could not update the following file to
The Checksum feature adds either 10 or 52 extra bytes to the size of
executable files. The /ag switch adds 52 bytes to executable files and
allows validation and recovery of infected files. The /av switch adds 10
bytes to the files and allows a validation check only. Either Checksum
option may cause MS-DOS 6.2 Step-Up to fail because Step-Up does not
recognize the system and executable files it attempts to update.
The /ag option can be reversed by running the following command:
The /av option can be reversed by running the following command:
Disabling Checksum by using the above switches should return the files to
their original sizes and allow MS-DOS Step-Up to upgrade the necessary
files. If MS-DOS Step-Up still fails, recopy the MS-DOS 6.0 system files
from the original MS-DOS 6.0 disks to the bootable partition of the hard
disk drive. If this is not successful, a reinstallation of MS-DOS 6.0 may
For more information, contact McAfee Associates.
The McAfee V-Scan is manufactured by McAfee Associates, a vendor
independent of Microsoft; we make no warranty, implied or otherwise,
regarding this product's performance and reliability.
| Modification Type:
|| Last Reviewed: