No, as far as I know, avast! doesn't have any pop-up blocker integrated.
avast! is the best antivirus software, not bloatware.
You should give us more information in the first place. Take a look at my signature. It's not made to show myself, but to give more information about my system, so I don't have to retype those system information every single time I want to post something in here...
The problem could be your software firewall if you have one, especially one of those like Outpost that has pop-up blocker integrated. Also, if you use some alternative to Internet Explorer like for example, MyIE2 or maybe Mozilla Firefox, Firebird or whatever browser that has pop-up blocker... just go there, find some settings and disable pop-up blocker.
I hope this helps a bit my friend...
Cheers !