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So, a couple of reinstallations later we are not wiser than before.
What we know so far is:
The problem occurs on “relatively native” XP SP3 machines, i. e. equipped with IE6 and without .NET framework (which is due to its version variety and overall bugginess unlikey to be base for a serious antivirus program at all).
The problem occurs both on XP SP3 Pro and Home editions (of the latter one we have just one machine in the park).
Simultaneously other XP users (with at least partially “unnative” systems such as IE8 being present there) stated Avast being working.
The problem occurs with Avast 17.7.
The problem doesn’t occur with Avast 17.5. (and most likely not with 17.6.).
The result of the problem is the inaccessibility of the main GUI window, which results in the inaccessibility of the virus container, manual scans and Avast tools.
The configuration GUI is still fully accessible.
I did as much testing as my boss allowed me. Deadline is end of October - if Avast doesn’t work then again, I’m forced to leave Avast. Which I really would like to avoid, because I like Avast. So please anybody help.