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File Version : 5.1.2600.0
Description : ATHEROS USB Driver
Copyright : Microsoft Corporation. All rights reserved.
Product Version : 5.1.2600.0
Product Name : Windows (R) 2000 DDK driver
Company Name : Windows (R) 2000 DDK provider
Internal Name : athusb.sys
File Size: 43392 byte(s) 42.384 KB
MD5 : 55bd3c43f33e82f3f7665712e2361826
SHA1: F4ADC1F6C5D4BFF6079F5B6FBC34D205D1B810BF

Download atdcm64a.sys
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How to Install atdcm64a.sys
Repair Sys ProblemsFixing a corrupted or missing atdcm64a.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.