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File version : 1.80.0702.2003 built by: WinDDK
Description : D-Link Air DWL-520 Wireless PCI Adapter
Copyright : Copyright(C) D-Link Corporation 2002-2003
Product Version : 1.80.0702.2003
Product Name : D-Link Air DWL-520 Wireless PCI Adapter
Company Name : D-Link Corporation
Internal name : DWL520.sys
File Size: 94976 byte(s) 92.768 KB
MD5 : 7418434c5876d16b0f3c7372a27e9556
SHA1: FA49504FA92D1018167973B0D4DAD1747DFFEE3D

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How to Install DWL520.sys
Repair Sys ProblemsFixing a corrupted or missing DWL520.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.