compaq presario cq40 — showing this copy of windows is not genuine

i purchased my laptop-COMPAQ PRESARIO CQ40 in june 2009.everything was giong fine..bt now i dont know how i got sme window updates..& i installed it online..bt after installing it is showing that-THIS COPY OF WINDOW IS NOT GENUINE. Please help me to understand this & also help me to solve this problem as soon as it possible.I stay in allahabad & i dont know where is the service center.
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