Press Windows + R , type certmgr.msc , and hit Enter.
He right-clicked the old one. A menu appeared. He saw → Export… (not what he wanted). Then he looked again: Delete . como excluir um certificado digital do pc
He paused and checked another site. The advice was clear: deleting a certificate from your personal store only removes it from your PC. It does erase the legally signed documents you already sent. It just tells Windows to stop offering that key. Press Windows + R , type certmgr
The old certificate vanished.
From that day on, he kept a small note on his desk: “certmgr.msc – check every 6 months.” And his digital life stayed clean, one expired key at a time. Press Windows + R
He opened his browser and typed: