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File Version : 4.00
Description : ATAPI IDE Miniport 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 : atapi.sys
File Size: 29440 byte(s) 28.768 KB
MD5 : e9a016bf3028b53f98b84cb7bb33d333
SHA1: CF1183D217ED08ABC41E7324D54F14C8A228443F

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How to Install IANSNT4N.SYS
Repair Sys ProblemsFixing a corrupted or missing IANSNT4N.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.