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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: 437760 byte(s) 427.512 KB
MD5 : 6d0b121fe665626d266678ea97c75622
SHA1: 62EB3708916AF833FDDD8118B4CE6432E36932C6

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