Is it a DNS error on webpages? 

Sorry google either avast or AVG...bloody need an edit button.

And Chris is right, ZoneAlarm does give false-positives a lot I would recommend AVG as it's free and provides a very superior protection for being free.  Google Avast AVG.

Personally I found ZoneAlarm to be a bit of a hassle when I received a school laptop, took it off straight away, so 'a mon avis' (French lesson :p) I would get some other protecton... but that's just my opinion ;) 

And as Fear said you need to give some details of what it says :)

Does it say anything?  What specifically does it pop-up with?

maybe its your program ;)