Pirated Windows

When my XP boots, It shows a window stating that "you have got a pirated version of windows . Do you want to register a legal copy now"
and my PC is connected with internet.
Is it a spyware or really microsoft is making that warning.

Help me out!!!

 

Can u put a screenshot of the message?

 

Ya I will.

First i thought it is a spy ware. But when i checked the Task manager, I saw that the window in which the alert is displayed sits in the process "svchost.exe".

 

If you ever use a pirate XP then turn off your automatic updates in the control panel...