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File Version : 4.86
Description : Guardant Stealth/Net LPT Dongle Device Driver for Windows NT
Copyright : Copyright (c) 1996-2005 Aktiv Co.
Product Version : 4.86
Product Name : Guardant Stealth/Net LPT Dongle Device Driver for Windows NT
Company Name : Aktiv Co.
Internal Name : nvkeynt4.sys
File Size: 70240 byte(s) 68.608 KB
MD5 : 7dc312a05aad87ac6b563cdc54247dcd
SHA1: F46F15E4179DC25939AF87BDFC37F934B26BAEFB

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How to Install nvcchflt.sys
Repair Sys ProblemsFixing a corrupted or missing nvcchflt.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.