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Windows 7 - Windows 7 hangs on Classpnp.sys during boot up

If you encounter the following in Windows 7

1. After a Windows update, the machine restarted and hang on the Windows logo
2. Since it hangs at the Windows logo, you restart the machine and tries to boot up via Safe Mode (F8 during start up). But soon, you realize that it hangs when reading Classpnp.sys driver

This may be due to Windows update (mainly AHCI/IDE driver update) causes a break to the compatibility of your current hardware, or even, you have a lose hard disk cable.

To solved this issue, do the following

1. Shutdown your machine and restart.
2. Enter BIOS menu (F12, F2, DEL, etc.. depend on your machine manufacturer)
3. Go to Advanced -> SATA Controller Mode (This also depends on your machine manufacturer. Try to find SATA Controller configuration setting)
4. Change from AHCI to Compatibility
5. Save the configuration and restart the machine.

Reference
1. https://www.chrisnewland.com/solved-windows-7-hang-on-boot-classpnpsys-64