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
SYMPTOMS
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
MS-DOS 6.2:
<filename>
CAUSE
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.
RESOLUTION
The /ag option can be reversed by running the following command:
scan /rg
The /av option can be reversed by running the following command:
scan /rv
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
be necessary.
MORE INFORMATION
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: |
Major |
Last Reviewed: |
11/22/1999 |
Keywords: |
KB110406 |
|