IDK. I've numerous hardware updates including CPUs ,mobos, the works and never had to reinstall. It should boot and ask to reactivate. If it fails to activate online I can show you how to activate by phone.
OK, but its almost never worked for me and the one or two times it did I ended up with a ton of driver issues and BSODs. Got fed up both times and Nuked the installed Windows and started from scratch.