system
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Davids advice is correct.
Some systems will “hang” if Avast runs with Trendmicro.
My Windows98 will stop mid scan on Trend Micro.
You do not need to “double scan” your system. Use Avast as a primary and the “online” scan as a backup should you run an Avast scan…it shows nothing…but you suspect an infection.
Depend on ONE AV and use the a manual or online to “confirm” system integrity.