System has not been modified error

when iam installing estnod 32 anti virus i got this error
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More about system modified error
  1. That is showing an installation error occurred and the installer rolled-back everything as though it had never started. It did you a huge favor. Something is wrong with your software package or you have a defect in Windows. Go to the Windows Update site and update your system, make sure you have Service Pack 3 installed and try again.
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