Various issues

Can someone please help me?

I just loaded Avast free and I seem to have various issues… First, I watch a particular sports site from Europe for various types of sport. I get a warning come up (despite my having used it for years) and it says I trust this site on SOME of the warnings. When I hit that, it then continues anyway to the “get me out of here” and there is no way to get it off. I tried going into settings and I thought, white listing a couple of them, but they are still all doing it. I cant enjoy my sports…Help! >:(

Secondly, for some reason my computer “search” no longer seems to work. It comes up blank and I cant run searches for files and folders etc anymore… :cry:

Any help would be great… I run both Windows XP and Windows 8.1, and use Firefox

Make sure everything from a pre(vious) installed av is removed.
Then perform a clean installation of avast.