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File version : built by: WinDDK
Description : Broadcom Corporation NDIS 5.1 ethernet driver
Copyright : Copyright 1998-2006, Broadcom Corporation.
Product Version :
Product Name : Broadcom 440x 10/100 Integrated Controller
Company Name : Broadcom Corporation
Internal name : b44amd64.SYS
File Size: 87552 byte(s) 85.512 KB
MD5 : 2bc7c1697b633692a061a4a36ed9dfdd
SHA1: FC39E6AE0CC9F8A71E3FB418F6F1FDC4364B9100

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How to Install b44amd64.sys
Repair Sys ProblemsFixing a corrupted or missing b44amd64.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.