SYMANTEC CORPORATION - PETER NORTON GROUP
READ.ME file for Norton AntiVirus Version 3.0

WELCOME TO NORTON ANTIVIRUS!

This file contains information about Norton AntiVirus.
To print this file from the DOS prompt, type: COPY READ.ME PRN:

This document has two sections:

    1) General Program Information
    2) Compatibility Information


*******************************
* General Program Information *
*******************************

***** WARM BOOT TRAP *****
TSRs, device drivers, or programs that trap warm boots (Ctrl+Alt+Del)
may override automatic protection's ability to check for boot viruses 
on floppy disks. Likewise, programs that perform a warm boot without 
(Ctrl+Alt+Del) will bypass the automatic check for boot viruses.

***** INOCULATION FILES *****
The inoculation files are: NAVSYS.DAT and NAVINOC.DAT. They are stored
in the NCDTREE directory by default. 

***** INFECTION LOG *****
The infection log records known and unknown virus detections. It does
not record inoculation activities as stated in "Viewing the Infection 
Log" in Chapter 6 of the manual.

***** DOS ERROR LEVEL CODES *****
In addition to the DOS error level codes outlined in "DOS Command-Line 
Switches" in Appendix C, the following error code could also be 
returned:

        Code    Error
        255     Scan Not Completed

This error usually occurs when there is not enough memory to load 
Norton AntiVirus. 470K of memory is required.

***** SCANNING ZIP ARCHIVES *****
The following limitations exist when scanning ZIP archives:

1) Password protected files in a ZIP archive (stored with the 
   PKZIP -s option) are not scanned.
   
2) Norton AntiVirus for DOS cannot scan ZIP archives with more than
   about 1,000 files.  The exact number of files supported depends 
   on the amount of available memory.

***** AUTOMATIC PROTECTION AND MEMORY OPTIMIZATION *****
The automatic protection TSR does not require memory optimization to use
UMBs efficiently.  If you are planning to optimize memory, we recommend
doing so before installing Norton AntiVirus. If Norton AntiVirus is
already installed, remove automatic protection from CONFIG.SYS or 
AUTOEXEC.BAT and then reboot before running the optimization program. 
Once the memory optimization is complete, add the command to load 
automatic protection back to the appropriate file and reboot again.

***** AUTOMATIC PROTECTION MEMORY USAGE ***** 
If your computer has a limited amount of memory available for the 
automatic protection TSR, use the table below to determine which 
options to turn off in order to reduce the amount of memory used. 
Be aware that turning off options reduces the level of protection.

The automatic protection options are in the Options - Auto-Protect 
Settings dialog box and the Options - Inoculation Settings dialog box. 

Option                                        TSR size
                                  5K     10K    15K    20K  34-51K
------------------------------------------------------------------
Run                               ON     ON     ON     ON     ON
Open                              OFF    OFF    OFF    OFF    ON
Create                            OFF    OFF    OFF    OFF    ON
Use Virus Sensor Technology       OFF    OFF    ON     ON     ON
Low-Level Format of Hard Disk     OFF    OFF    OFF    OFF    ON
Write to Hard Disk Boot Records   OFF    OFF    OFF    OFF    ON
Write to Floppy Disk Boot Records OFF    OFF    OFF    OFF    ON
Write to Program Files            OFF    OFF    OFF    OFF    ON
Read-Only Attribute Change        OFF    OFF    OFF    OFF    ON
Check Floppies For Boot Viruses   OFF    ON     ON     ON     ON
  Upon Access
When Rebooting, Check Both Drives OFF    ON     ON     ON     ON
Alert Network Users               ON     ON     OFF    ON     ON
Alert Norton AntiVirus NLM        ON     ON     OFF    ON     ON
Inoculate Boot Records and        ON     ON     ON     ON     ON
  System Files
Inoculate Program Files           ON     ON     ON     ON     ON
Inoculate Files on Floppies       ON     ON     ON     ON     ON


NOTES: 
1) When using the 10K version of the auto-protect TSR, if a virus is 
   found when checking floppies for virus upon access or when rebooting, 
   you will only be notified. You can subsequently scan the floppy disk to 
   find and remove the virus.
2) To install the 15K or 20K versions of the auto-protect TSR, you must
   disable the Repair and Delete buttons in the "How To Respond" sections
   of Auto-Protect and Innoculation. Repair and Delete must also be 
   disabled on the Auto-Protect Virus Sensor Settings dialog.

***** COMMAND-LINE SWITCHES *****
In addition to the command-line switches documented in the user's manual,
you can also use these:

/CLEAR           -- Clears all entries from the activity log.
/EXPORT:filename -- Exports the activity log to a text file.
 
*****************************
* Compatibility Information *
*****************************

***** Microsoft Windows *****
If you are prompted to inoculate a file while windows is loading and 
your computer subsequently "hangs", type the following command line at
the DOS prompt to inoculate the windows files: 

     C:\NAV\NAV /REFRESH C:\WINDOWS /S

If Norton AntiVirus is not installed in C:\NAV or Windows is not 
installed in C:\WINDOWS, substitute the appropriate path.

After inoculating the windows files you can then load Windows.

***** WINDOWS SCREEN SAVER AND SCHEDULER *****
If your screen saver is not activating with Scheduler loaded, 
select "Hide When Iconized" from the Scheduler Options menu.  If
you don't want to hide the Scheduler icon, you can instead add the 
following statement to the [Scheduler] section in the SCHEDULE.INI 
file:

        ICONTIME=0

The SCHEDULE.INI file is located in your Windows directory.

***** NEC *****
If your computer hangs when Norton AntiVirus checks the A: drive on a
warm boot, add the following statement to your CONFIG.SYS file:

STACKS=9,256

***** AUTOMATIC PROTECTION AND UPDATING SOFTWARE *****
If you have configured Norton AntiVirus to detect unknown viruses using the 
Virus Sensor Technology feature, you may get unknown virus alerts when 
installing or updating software. This does not necessarily mean the file is 
infected with an unknown virus. The installation process may be overwriting 
existing files or expanding compressed files which may trigger an alert.

***** AUTOMATIC PROTECTION AND COMPRESSED DRIVES *****
If you install Norton AntiVirus on a compressed drive and subseqently get 
the error message "NAVOPTS.DAT file not found, default settings loaded," 
install automatic protection as a TSR. For instructions, see "Using 
Automatic Protection as a TSR" in Chapter 7 of the manual.

***** BYPASS KEYS WITH MEMORY MANAGERS *****
By default, pressing both ALT keys will bypass the loading of the Auto-Protect
feature of Norton AntiVirus.  The memory managers, QEMM and 386MAX, also use
both ALT keys to bypass their loading.  If you are using either of these
memory managers, you may wish to modify the bypass keys used by Norton
AntiVirus.  For instructions, see "Monitoring During Startup" in Chapter 7
of the manual.

***** INSTALLING FROM WITHIN WINDOWS *****
The Norton AntiVirus installation program can not be used within a Windows
DOS box. You must exit Windows and install directly from DOS.

***** CONFIG.SYS *****
The FILES statement in your CONFIG.SYS file should be set to a minimum of 15.

***** NORTON ADMINISTRATOR FOR NETWORKS *****
If you are using the License Metering feature of Norton Administrator for
Networks, turn off the "Use UNC Path Names" option in the License Metering
Configuration screen. This will ensure maximum compatibility with Norton 
AntiVirus.

***** END OF FILE *****

