Looking back over this topic:
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one thing I wondered, under windows program files and under alwil is still 'avast 5' folder. And all the files in that have the date of 2010 when I first downloaded avast, yet the files are listed as having the latest update, 6.0.1203 that I downloaded yesterday.
This is normal if you updated from avast5 to avast6 using the avastUI, it would be too big a task to change all associated program folders and associated registry entries with avast running.
Only if you did a clean install of avast6 would you have the folders AVAST Software and Avast, e.g. C:\Program Files\AVAST Software\Avast
