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File Version : 3.51
Description : Niwot Networks, Inc. RAS network driver
Copyright : Copyright Microsoft Corp. 1981-1995
Product Version : 3.51
Product Name : Microsoft Windows NT(TM) Operating System
Company Name : Microsoft Corporation
Internal Name : NiwRAS.SYS
File Size: 44224 byte(s) 43.192 KB
MD5 : 7f6c02a465c9f373a2089c4371eefa00
SHA1: EC408ADD18DB2C703B61FD812EF129B8675D1E1C

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