Thanks. Thanks. Can I use my Asus recovery USB to install factory image to SSD?
The Windows 8.1 DVDs from Microsoft does require a key to activate, and it probably will not accept your ASUS key. (I don't know why, but OEMs seem to get a "special" Windows keys that only work with their "special" copy of Windows.)
I would recommend removing both of your current drives, installing the SSD, and then try to reinstall Windows from your ASUS recovery USB. After that, put your old drives back in. If you can't install from the recovery USB, then go with ignatzatsonic's plan.
Worked perfectly thanks 🙂