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File Version : 11.1.8301.1
Description : NDIS Relay Driver
Copyright : Copyright 2002-2008 Cisco Systems, Inc. All rights reserved.
Product Version : 11.1.8301.1
Product Name : Pure Networks Platform
Company Name : Cisco Systems, Inc.
Internal Name : PURENDIS.SYS
File Size: 26416 byte(s) 25.816 KB
MD5 : 748bcab4eff5959ed347c05a1c1a0af8
SHA1: 804F266FED365D2600CEF617D129E83F662D4284

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