Microsoft KB Archive/79527

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Windows Err Msg: Attempt to Load Duplicate...(PC Tools/Norton)

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Q79527

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The information in this article applies to:


 * Microsoft Windows versions 3.0, 3.0a, 3.1, 3.11

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SYMPTOMS
The following message may appear when you attempt to start Windows in enhanced mode:

Attempt to load duplicate device file that may be needed to run Windows in 386 enhanced mode; run Setup again.

c:\windows\system\vdmadx.386

CAUSE
This error is due to a conflict between PC Tools (versions 7.0 and later) and Norton Desktop for Windows (version 1.0), both of which are adding their own virtual device drivers (VxDs) to the [386Enh] section of the SYSTEM.INI file.

PC Tools installs:

  DEVICE=VDMAD.386   (Virtual DMA-REPLACES &quot;device=*vdmad&quot;) DEVICE=VFD.386    (Virtual Floppy Disk-REPLACES &quot;device=*vfd&quot;) Norton Desktop for Windows installs:

  DEVICE=VFINTD.386  (Virtual Floppy Interrupt) DEVICE=VDMADX.386 (Virtual DMA-REPLACES &quot;device=*vdmad&quot;) DEVICE=VNSS.386   (Virtual Screen Saver) The PC Tools VDMAD.386 file and the Norton VDMADX.386 file BOTH replace the Windows internal device *vdmad. PC Tools installs VDMAD.386 at the beginning of the [386Enh] section, and Norton Desktop installs VDMADX.386 at the end of the [386Enh] section. When Windows is loading, it loads the PC Tools device driver first and then tries to load the duplicate driver VDMADX.386, which produces the error message.

WORKAROUND
Remark the Norton Desktop DEVICE=VDMADX.386 line in the [386Enh] section of SYSTEM.INI. Remarking both device lines will cause Windows to exit to the MS-DOS command line when Windows tries to load in enhanced mode. If you need to remark both lines, place the line

"device=*vdmad" in the [386Enh] section of SYSTEM.INI.

MORE INFORMATION
Symantec has confirmed that this problem only occurs when PC Tools is installed after Norton Desktop. Norton Desktop detects the PC Tools DMA device driver and uses it; whereas, PC Tools does not detect the Norton Desktop DMA device driver. According to Symantec, Norton Desktop for Windows functions correctly with the PC Tools VDMAD.386 device driver.

For more information on these device drivers, query on the following words:

"windows and 3.00 and device=*vdmad" The Norton Desktop and PC Tools products included here are manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding these products' performance or reliability.

Additional query words: ndw pctools err msg errmsg desk top 3.0 3.00a 3.00 3.0a 3.10 3.11 3rdparty

Keywords :

Issue type :

Technology : kbWin3xSearch kbWin300 kbWin300a kbWin310 kbWin311