Yes, the blue screen is normal for doing that.
You don't have to re-install Windows, although that is the recommended approach.
You have to set the bios back to where it was. Reboot to Windows. Install the AHCI driver but don't reboot yet.
Then there is a registry alteration to make, so that the machine boots well using AHCI.
I'll Google for it and see what I can find. I forget it, from the top of my head.