the other antiviruses and spyware/maylware programs are not and never are running… their services and startup items are disabled there are no incompatibilities taking place. video files don’t spread malware if A video files makes a certain media player say “blah blah needs to access internet to get data or cert” or w/e used to happen years ago you just close that thing down and delete the file cause its trash. If you learned how to read, I said I have them only for manual scanning if I EVER detect a virus that I don’t think is a false positive on the off chance it ever happens. Please learn reading comprehension.
Sure viruses and stuff have shifted to be less destructive and more on the keylogger side but then avast wouldnt help with that because every AV I’ve ever used never found one. Please try to be less ignorant, I’m sure you deal with plenty of dumb people on these forums but I’m not one of them, not by a longshot. Prevention is not doing obviously stupid things that will get you viruses like running things you don’t know anything about. Most of the things you mentioned would only ever happen if a virus was a full blown process or something or behind a rootkit actively moving around files and stuff, which again isn’t happening.