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First, they got rid of that hack to get rid of the nag screen.
Now they play with NTFS permissions to give the installation folder special permissions that somehow block even the computer administrator from modifying it. Even in safe mode you can't touch the folder.
They also added one of those toaster nag screens that keeps giving you ad's and can interrupt programs. I have also had the nag screen lock up and prevent you from closing it, and you can't end task it because it has that same odd user permission.
So I can't recommend Avira anymore as a free virus scanner.

Security essentials does exactly what a virus scanner should do, protect your computer, and stay quiet about it. I have it installed on my parents computer and they have no idea it's even there, it updates and scans quietly without slowing the machine down.