Fast Internet speed, some webpages and images won't load on wireless

I have a mac and have it connected to a wireless router. Some webpages don't load, i get the "google can't find this page" etc. Other websites work great. Some websites, like facebook won't load images. Some websites when loaded will not load css..

The problem isn't speed. I just did a speed test and am showing 19 mbps download.

I plugged straight into my modem and everything worked fine so I am assuming it is my router.

I have a Belkin N Wireless Router.

Whart setting can I change on my computer or router to fix this?

 

Thanks that helped out.

I added the openDNS to my DNS tab under network preferences.

Everything seems to be working just fine now.

I have no idea what I did technically but oh well.



It has never done this before, could this be due to changing ISP's?