Microsoft KB Archive/81743

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Norton Antivirus Drivers Hang SMARTDRV.EXE

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Q81743

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The information in this article applies to:


 * Microsoft Windows versions 3.1, 3.11

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SUMMARY
Norton Antivirus for Windows and MS-DOS has two drivers that load in the CONFIG.SYS: NAV_.SYS and NAV&.SYS. These drivers can conflict with Microsoft Windows 3.1's SMARTDRV.EXE version 4.0.

MORE INFORMATION
The conflict between the drivers can cause the system to stop responding (hang) during startup or can cause the scanning process to fail. The following are the conditions for conflict.

System Hangs During Boot Process
Both the Norton drivers and SMARTDRV.EXE file automatically load into the UMB area between 640K and 1024K, where they conflict with each other.

There are two solutions to this problem:

  Modify the AUTOEXEC.BAT file's SMARTDRV.EXE line and add a /L parameter to force SMARTDRV.EXE to load low, as follows "C:\WINDOWS\SMARTDRV.EXE /L xxxx yyyy" where xxxx is size and yyyy is winsize.   Modify the CONFIG.SYS file and add a /B to the NAV&.SYS line: "DEVICE=C:\NORTON\NAV&.SYS /B"

Scanning Process Fails
Norton Antivirus may give the following error message on a low-memory machine running SMARTDRV.EXE:

Not Enough Memory to Scan Application

To solve this problem:


 * Free additional memory by not loading other drivers or terminate-and-stay-resident (TSR) programs.

-or-
 * Disable SMARTDRV.EXE.

Norton Driver Descriptions
NAV_.SYS is used to scan for viruses whenever an application is launched or a file is copied, and detects boot-sector and partition- table viruses. It takes up more memory and is faster than NAV&.SYS.

NAV&.SYS is used to scan when applications are launched and detects boot-sector viruses on floppy drives. It is more compact than NAV_.SYS, and uses overlays. The /B causes NAV&.SYS to use more memory and bypass the conflict in the UMB area.

The Norton products included here are manufactured by a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Additional query words: 3.10 3.1 3.11 norbert smartdrive win31 3rdparty 6.00

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Issue type :

Technology : kbWin3xSearch kbWin310 kbWin311