system
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I just installed Avast! Home on both my home computers - both with Win XP SP1. The first was a Dell XPS, which did not produce this script error. The other computer was a Dell 4550 and this script error did show up. Neither computer had the KB811630 hotfix.
However, the avast4.ini file fix (ShowHelpCheckList=1) solved the problem. Still, I wonder why it happened… ???