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File Version : 10.1.80
Description : VPN Driver
Copyright : Copyright 1996-2007 Aventail Corporation
Product Version : 10.1.80
Product Name : Aventail(R) Connect(TM) with Smart Tunneling(TM)
Company Name : Aventail Corporation
Internal Name : ngvpn.sys
File Size: 78608 byte(s) 76.784 KB
MD5 : 5a89b02aa4004bcc449a3825ee24ae22
SHA1: 27FC20D6346C2D905417FF823C01800E5D9CE12E

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