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File Version :
Description : NDIS 5.0/5.1 driver
Copyright : Copyright 2002, ATMEL All Rights Reserved.
Product Version : ver. 6.101.x.86, 503A
Product Name : 802.11b Compliant USB Wireless Network Adapter
Company Name : ATMEL
Internal Name : AT76C503A with RFMD BB and Radio
File Size: 99840 byte(s) 97.512 KB
MD5 : f5ef5a2b749c8ba69681d817baad7fc0
SHA1: A7DA1241D4458B265809DC7E0AC47C30DF602B6B

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