Remember those days when you popped in a CD or connected a USB device to your system and it will hang indefinitely, also called system freeze. There are many other actions that can lead to system freeze and most of them have to do with Explorer Windows. System freeze can be unexpected and can even hit your powerful i7 core system running Windows 7, nothing can escape its clutches and the only solution most users are left up with is to restart their system.
Luckily, Microsoft has included a very useful option hidden inside the “Folder and Search options” of Explorer that launches folder windows in a separate process. It is only for advanced users and is to be enabled in the system which has a lot of spare resources, i.e, lots of RAM.
Navigate to Organize -> Folder & Search Options -> View tab, and tick ‘Launch folder windows in a separate process’ option.
Now the next time one of your folder hangs, it will not freeze your whole system.
So why is this option not enabled by default? Because it has many side effects and should not be used on systems with less than 4GB RAM (since it takes slightly more memory). Also it can confuse Explorer extensions when they find there are more than one instance of them running.