Weird, i'm positive i installed secureDNS, but the ip addresses for my DNS were still set to 'obtain automatically', so i switched them to manual ones that comodo supplies. That still didn't work well (still blocking lots of stuff), then set them to 'obtain automatically' again. After that it seems to be working properly again.
Thanks for your help HeffeD! wouldn't have been able to do it without you.
Will be sure to return if the problem comes back again