It is benign but a bit annoying because it overlays all windows. You can just use a "rogue" KMS server to activate Windows with no risks for you. For example,

It is benign but a bit annoying because it overlays all windows. You can just use a "rogue" KMS server to activate Windows with no risks for you. For example, as an admin: slmgr /skms kms.digiboy.ir