Sounds fun, Tofski. I'll have to stop by and say "hello".
Also zoroark, it's not adfly/mediafire that give you viruses. Those sites simply allow people to host and distribute files. It's the files themselves that you download that may contain viruses.
This is why it's important to recognize file extensions. As a general note, you should never double click a file ending in .exe or .bat downloaded from a not trusted source. However, they're not always bad for example "minecraft.exe". You just need to use your better judgment.