Will Windows stay activated after you change your HWID? It depends on how your Windows is activated — and in most cases the answer is reassuring.
Digital licence linked to a Microsoft account
This is the easy case. A digital licence tied to a Microsoft account survives an HWID change — Windows re-checks the account at the next boot, and if you are signed in, activation comes back on its own within a few minutes.
OEM activation tied to the motherboard
This is the more delicate case. An OEM licence is bound to the motherboard. Most of what HWIDChanger changes — Windows IDs, the disk volume serial, MAC — does not disturb it, but if Windows does show "not activated", the built-in Activation troubleshooter (Settings, System, Activation) usually restores it in a minute or two.
Corporate (KMS) activation
KMS activation is tied to a company's server rather than your local hardware, so an HWID change is essentially transparent — the machine re-activates against the server as usual.
The one habit that helps
Before changing your HWID, make sure your Windows licence is linked to a Microsoft account. It takes under a minute and turns any reactivation into a simple sign-in rather than a search for a lost product key.