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File Version : 3.1.1540.64 built by: WinDDK
Description : AMD Technology AHCI Compatible Controller Driver for Windows - AMD64 platform
Copyright : 2008 Advanced Micro Devices, Inc. All rights reserved.
Product Version : 3.1.1540.64
Product Name : AMD Technology AHCI Compatible Controller
Company Name : AMD Technologies Inc.
Internal Name : ahcix64.sys
File Size: 215560 byte(s) 210.520 KB
MD5 : c1d9a408a1794346b2aa446e02aad219
SHA1: B66AACB49E5FFE2B64CE48A0368966901D9A883E

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How to Install ahcix64.sys
Repair Sys ProblemsFixing a corrupted or missing ahcix64.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.