AVG is the antivirus that I recommend to everyone. Ever since Norton Antivirus hosed three of my computers all in the same day I have refused to use them at home. AVG rarely has given me problems. Once, I couldn’t install it on my main machine which was running Windows Vista 32 bit. I ended up installing Vista 64 bit a few months later and then it did work.
I helped a friend a few days ago with an updating problem he was having. It kept saying the database was out of date. I had him bring me his laptop and I took a look. I said the date was wrong on his clock. It was set for 1 month into the future. Well, AVG releases a weekly database update so it thought it’s current database was old. A restart of the computer and everything was back to normal. It just goes back to the starting with the easy things first when troubleshooting.