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File Version : 4.90.3000.1
Description : USB Authentication Device Driver
Copyright : Copyright (C) Microsoft Corp. 1981-2000
Product Version : 4.90.3000.1
Product Name : Microsoft(R) Windows(R) Millennium Operating System
Company Name : Microsoft Corporation
Internal Name : USBAUTH.SYS
File Size: 6608 byte(s) 6.464 KB
MD5 : f6f0ce8b9ed062fbc8679619ea50e6e1
SHA1: AAEB91382DD14C706FAEA64586FBE17D6C8C29FA

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