I tried Avira Free, based on this review, but when I tried copying software files from one drive to another, Avira blocked me from copying WinZip.exe and a couple of other files that I KNEW were harmless. Avira did not have an option for me to override the block. Also, Avira slowed down my browser (Google Chrome) very noticeably, compared to Panda Free, which I was previously using. Panda Free never gave me any false positives. Bottom line--I've gone back to Panda.
I can't get rid of it. I'm about to reinstall windows to get rid of it; Avira IS malware in my book. It's much more like an infection than installation, as you can never straightforwardly uninstall it.