, Sven Groot wrote

Not in any supported fashion. And any unsupported hack that might conceivably allow you to do it will inevitably hose your system in some way, since IE is a rather important component of the OS.

Why do you want to do this? If it's for testing purposes, I recommend using a VM.

I don't want to do this, my son does. He's looking at buying a new laptop, with Windows 8,  but he wants to go to IE8.