http://download.cnet.com/Avast-Free-Antivirus/3000-2239_4-10019223.html?part=dl-85737&subj=dl&tag=button

This is where I went. I clicked download and when it came to installing it, it just said the Base Filtering Engine Service is not running. Ensure it is enabled before installing Avast.

The BFE wasn’t in my Local Services so I added it back but it says I have been denied permission to start it