Win7 system AHCI is turned on and restarts. Blue screen cannot be started or crashed. Solution

After installing Win7 system, if you use IDE mode, everything is normal. After the AHCI mode is enabled in the BIOS, it will crash, blue screen, unable to start and other faults.
Cause analysis:
The possibility of a normal hardware failure in the IDE mode is extremely small. Generally, the cause of the problem is caused by an abnormality in the WIN7 random AHCI driver match.
Solution:
1. In the "Registry Editor" window title bar, navigate to the HKEY_LOCAL_MACHINESYSTEM CurrentControlSetservicesmsahci branch, then in the right window, double-click “Start”. In the "Edit DWORD Value" dialog box that opens, change the value in the "Value data" box from 3 to 0.

2. Reboot into the system desktop, click the computer right---Properties---Device Manager, as shown in the figure:

3. Uninstall all the devices in the IDE ATA/ATAPI controller, such as Figure:

When the restart option appears, click No.
4. If there is an option that cannot be deleted, it can be ignored.
5. Restart AHCI mode and modify the BIOS, and the system enters the normal
6.Win7 system automatically loads all normal AHCI driver, as shown:


NOTE:
Generally, the problem is mostly caused by installing Win7 system in IDE mode. This test uses host M7100Z H61 motherboard chipset, and the system is Win7 Professional Edition (OEM).