How to Install AHCI Support for ATI SB600 SATA Controllers on Existing Windows 7 Installations

Step-by-Step Guide

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   Step 1: Backup your data because backups are good things.

     Although this procedure is simple enough not to produce great risk of a failure, no backup eventually will mean no data
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   Step 2: Do NOT enable AHCI in the BIOS yet.

     If you are reading this article you have probably experienced a blue screen of death after enabling AHCI in your systems' BIOS so follow these steps first. ,  (Either use Run and type Regedit, or Start and enter Regedit in the search box, or whatever means you are accustomed to).  If you have User Account Control enabled you will have to enter Yes to continue. ,,,,  Windows will now install Microsoft's AHCI driver and boot into Windows.  (You will probably have to restart the system again after that process is complete).  
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   Step 3: Open Regedit.

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   Step 4: Locate the following registry subkey:  HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci

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   Step 5: In the right pane

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   Step 6: right-clickStart in the Name column

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   Step 7: and then click Modify.

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   Step 8: In theValue data box

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   Step 9: type 0

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    Step 10: and then click OK. (Note: if the value there is already 0 then this solution will not work)  Exit Regedit and reboot your system.

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    Step 11: NOW enable AHCI in the BIOS during reboot.

Detailed Guide

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