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Had exactly the same problem that you described. No quick scan after Avast installed, on reboot BSOD everytime - something about page fault in non paged area. Uninstalled in safe mode and tried to re-install in normal mode but got the same problem. Gave up and went back to my back up which is running a version of Avast 8. I’m wondering if there is a conflict with Zone Alarm. Are you using Zone Alarm free firewall? The system is also Win XP Pro SP3 32bit.