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If you have not updated to SP3 that has been available for almost a year that has several Critical Security fixes then the system is probably infected with malware preventing avast! install.Download Malwarebytes MBAM:http://www.malwarebytes.org/mbam.php If you can not get to the site then the system is definitely infected and you will have to download on a no-infected system then use the special removal instructions:http://www.malwarebytes.org/forums/index.php?showtopic=9573