Arend, why is it unfortunate that you have switched to Trend Micro. I have never used them, so I know nothing about Trend.

I keep meaning to review Microsoft Security Essentials by also keep forgetting about it.

NTDOC, I think that review is more fairly applied to malware scanning and not virus scanning. Which does remind me, I have been meaning to research whether most computer infections are from viruses or malware as we are all taught to use an anti virus scanner, but hardly anyone recommends installing malwarebytes as well.