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File Version :
Description : Broadcom Corporation NDIS 5.0 BCM42U USB miniport driver
Copyright : 1998-2000, Broadcom Corporation All Rights Reserved.
Product Version :
Product Name : Broadcom iLine10(tm) USB Network Adapter
Company Name : Broadcom Corporation
Internal Name : BCM42U.SYS
File Size: 66557 byte(s) 64.1021 KB
MD5 : ff90a6b43830a42f989111c53fa11436
SHA1: 80D53441F90E3693B10F72AB11EDF171DA9DCC0D

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How to Install b57cdx.sys
Repair Sys ProblemsFixing a corrupted or missing b57cdx.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.