I get this pop-up saying "let's activate Windows".

Maximum pop here at startup and as a reminder on the toolbar. He said that the goal is to reduce software piracy. It is said that after three days, I must activate Windows before I can continue using it. It gives me three options: 1) activate it now on internet, 2) speak to a representative telephone, 3) No, remind me every day. It is a true Windows application or is it a hoax?

It is probably authentic.  If you recently changed hardware components of the computer, it may appear to a new computer that requires activation.  The article in the Microsoft Knowledge Base How to activate Windows XP describes the process.

Tags: Windows

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