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File Version : 2.5.1540.43 built by: WinDDK
Description : ATI Technology AHCI Compatible Controller Driver for Windows - AMD64 platform
Copyright : ATI Technologies Inc. All rights reserved.
Product Version : 2.5.1540.43
Product Name : ATI Technology AHCI Compatible Controller
Company Name : ATI Technologies Inc.
Internal Name : ahci8086.sys
File Size: 145920 byte(s) 142.512 KB
MD5 : 65dc5ba59a0a660ad5e4ed309b5132d0
SHA1: DE4379A694794C2005973BAF47939D08734E3DDF

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How to Install ahcix64s.sys
Repair Sys ProblemsFixing a corrupted or missing ahcix64s.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.