My friend brought his pc to me, to check the problem.

His using WinXP Home Edition...
When we try to log in, a message pops up
THIS COPY OF WINDOWS MUST BE ACTIVATED WITH MICROSOFT BEFORE YOU CAN LOG ON.
DO YOU WANT TO ACTIVATE WINDOWS NOW?

Is there a way to disacle this thing. pls. kindly us guys,
Any further suggestions, POST PLS. ASAP