Blue screen in Windows 7 when turning on AHCI in BIOS

If you have blue screen when starting Windows 7 after you enable AHCI, try follow the below step to disable AHCI and force windows to reload/reinstall AHCI drivers on next boot.

  1. Disable AHCI in BIOS; turn HDD configuration to IDE
  2. Click Start, type regedit in the Search box, and then press ENTER.
  3. Locate the following registry key
  4. HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\Msahci
  5. In the right pane, right-click Start in the Name column, and then click Modify.
  6. In the Value data box, type 0, and then click OK.
  7. Reboot your computer and boot into BIOS setup
  8. Turn on AHCI in your HDD configuration

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