I already have a few measures in hand:
1) Firefox with Ghostery, Adblock Plus, Procon Latte (OK, naughty websites are often security compromised), WOT, Webutation.
2) Only install software from repos.
3) Boot with an external hard drive instead of the internal one, and avoid Windows as much as possible. （Since the advent of external hard drives, I don´t mess with internal hard drives anymore.)