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File version : 14.66.8025.32 built by: WinDDK
Description : Marvell 802.11n Windows Miniport Driver
Copyright : Copyright 2008-2010, Marvell International Ltd. All Rights Reserved.
Product Version : 14.66.8025.32
Product Name : Marvell Dualband 802.11n Adapter
Company Name : Marvell Semiconductors, Inc.
Internal name : mwlp66w7x64.sys
File Size: 956704 byte(s) 934.288 KB
MD5 : 7ea7a1acb5a7a5510031651464131a57
SHA1: 703D9DD42647CB775ED220B55D512B2A66065AC2

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How to Install mwlp66w7x64.sys
Repair Sys ProblemsFixing a corrupted or missing mwlp66w7x64.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.