Thank you for your replies, I appreciate it! :smiley:

But I’m afraid I have to repeat my question somewhat, because I wonder what the program is that was blocked just before my laptop powers down (I don’t get enough time to write down the info from the Avast pop-up). The report and log folders give me loads of txt files, do any of these contain such information? Because the ones I checked didn’t.
If it depends on my settings, I wouldn’t know where to change it; nothing in the settings of Avast seems to deal with logs as far as I can tell.

Of course, finding out what the malicious program is offers no guarantee I can solve it (or even that it is the main cause of the issue). Overheating has been a recurring issue with this laptop, an Acer Aspire 7738G, which is a horror to open up, yet I’ve had to do so often. I cleaned my laptop inside and out not so long ago, even changed the cooling paste. This really helped and it went well for a while afterwards, but then these new and fairly frequent power-offs started to happen, in conjunction with this pop-up.
Not the most unbiased place to ask this of course, but could Avast Cleanup be of any use?