Steam - how safe?

Howdy ya’ll,

I did a search for Steam and all I found were threads about Counter Strike :sure:

My guy’s kid runs Steam on my machine. Now I have SpyBot, AVG, and Norton AntiVirus and so far so good (knock thrice). But I am curious to know - how safe is Steam? I’m really not into the whole file sharing thing and I hate the idea of my computer being open to anyone and everyone. But I don’t really want to kick the kid off so what’s the deal? Is my machine at risk?

thanks ya’ll :smiley: