system
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I hope you did it under Windows Safe Mode.
then reinstall the latest version, and the problem is still here (BSOD during boot). I've done the same with the previous version of Avast (6.0.1203), and I have no problem to boot.
Any chance you can get some memory dump files of those BSOD? Do you need any instructions to find them in your system, compress them and upload them to the Avast upload ftp site?