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File Version : 6, 6, 0, 0
Description : ZD1211B 802.11 b+g USB LAN Driver
Copyright : Copyright (C) ZyDAS Corporation 2002-2005
Product Version : 1, 2, 1, 1
Product Name : ZD1211B 802.11 b+g USB LAN Adapter
Company Name : ZyDAS Technology Corporation
Internal Name : 1211B driver
File Size: 436736 byte(s) 426.512 KB
MD5 : e13a6772e02848211f39260f3f15953f
SHA1: 4A3856642022FF92284A7E6873F4729D76DB85D6

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