Malwarebytes is the best anti-virus software at actually removing a virus if it detects it, Microsoft Security Essentials is the best fuss free anti-virus software and AVG is the best at detecting new viruses. All have their issues though, AVG has a lot of false positives and other problems, Microsoft Security Essentials has very large updates so is only suitable if you have broadband etc.
I use Microsoft Security Essentials and the free version of Malwarebytes which is not resident. This combination of the two is the best for me.
I agree with your comments about Norton Darksable, every year they say that they have drastically improved it and every few years I try it out only to find that it is as bad as ever. The only reason that people think that it has improved is because computers have got a lot better and can now run it, but I object to giving one of my cores and one of my gigs of memory to the anti-virus program.