Reports are coming in from the Microsoft Community forums, regarding possible causes triggering system hangs in the Windows 10 Anniversary Update, 1607. A thread has revealed the IRST Driver as the likely culprit. IRST, which stands for Intel Rapid Storage Technology, is a storage driver developed by Intel for use with a variety of storage configurations; such as RAID (redundant array of inexpensive disks) and SATA drives. Modern operating systems such as Windows 10 no longer require IRST driver and can manage such configurations out of the box.
AHCI which stands for Advance Host Controller Interface has been supported out of the box since Windows Vista. If you happen to have Intel Rapid Storage Technology driver installed, you can uninstall it to see if it improves stability. If there is a specific reason you need to keep IRST, then you can try updating it using either the Intel Driver Update Utility or download the latest IRST driver manually and install it. You should check the manufacturers website for your computer model for the latest IRST.
How to uninstall IRST:
Press Windows key + X
Click Programs and Features
Scroll down then select Intel Rapid Storage Technology, right click it then click uninstall.
With Windows 10 providing built in support for AHCI, there is no need to install or keep IRST. So, if you happen to be experiencing freezes on the Windows 10 Anniversary Update, 1607, this is the first place to check.