Well, I’m glad that I use Linux…
The next time a website says to download new software to view a movie or fix a problem, think twice. There’s a pretty good chance that the program is malicious.
I don’t download many programs from random websites, as Ubuntu has a large repository of applications that are legit. I do reccomend being careful on where you download applications from, only download from places that you trust.
For me it also helps that most viruses are made for Windows, and thus won’t work on Mac or Linux (though I have heard of a few Mac viruses recently too…)