Where you don't what, exactly? Run software from untrustworthy sources that contains viruses? Okay, but you don't need to change platforms to do that.
http://www.macnn.com/articles/16/06/01/researchers.show.that...
http://www.zdnet.com/article/lenovo-rootkit-ensured-its-soft...
http://www.makeuseof.com/tag/now-three-pre-installed-malware...