Testing malware on your host PC and Microsoft Essentials...
Add a free AV, there are tons of good solutions: Avast Free, Kaspersky Free, Panda Free, Avira Free, BD Free, etc.
Add ZAM Free and EEK or NPE.
Add SandBoxie Free (and use it while browsing to have more protection).
Add HTTPS Everywhere and uBlock Origin.
Follow suggestions about backups.
Thanks for sharing.