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File Version : 4.00
Description : SMC/WD Ethernet network driver
Copyright : Copyright (C) Microsoft Corp. 1981-1996
Product Version : 4.00
Product Name : Microsoft(R) Windows NT(TM) Operating System
Company Name : Microsoft Corporation
Internal Name : SMCISA.SYS
File Size: 24816 byte(s) 24.240 KB
MD5 : 714e79f1c392dc21101d43bfa0f8ed70
SHA1: 10C10F43B1281AC6217A6B443DFD2D1B2DF22F00

Download SLPNN40.sys
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How to Install SLPNN40.sys
Repair Sys ProblemsFixing a corrupted or missing SLPNN40.sys error is an easy process with a few steps. Open the zip-file you downloaded.Extract the .sys file to a location on your computer. We recommend you to unzip the file to the directory of the program that is requesting the file.
If that doesn't work, you will have to extract the file to your system directory.
By default, this is C:/WINNT/system32/drivers (Windows NT/2000).
or C:/Windows/system32/drivers (Windows XP, Vista, 7).
Make sure overwrite any existing files (but make a backup copy of the original file)
That should be it. Although not necessary you can reboot your computer as well.