yup! If you did not surf porn in the first place, you won't get those porn ads...the most u'll get are clean advertisements... some porn sites will automatically downloads scripts for you such that u'll get porn pop up ads...sometimes it gets as bad as changing your homepage into a porn website and there's no way you can change it back... I'm speaking frm experience...hahaha

Anyway, to prevent pop-up ads... you can go to windows update and download service pack 2... it has a function that blocks pop-ups...
By the way Ding Shanben...i've been wanting to say this to you... i wonder whether your identity that u claim about yourself is even true....you're a married man but you seem so kiddish and helpless when it comes to minor and stupid problems.... i really dunno how to decribe you.... sounds like u're a married BOY instead.... or maybe u're juz using a fake identity to spice up this forum...duh