AVG Anti-Virus Free Edition 2012
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Full user review
"It's ok, for a free version."
Through years of experience with computer security, AVG has very easy settings to understand. It also has a great anti-spyware that beats other AVs, but seems to be not worth it.
AVG has higher false positive ratings then Avast or Avira. Its detection ratio is also lower then out of the 3. AVG doesn't have advanced heuristics like Avast or Avira has.
I would recommend Avast or Avira over AVG, but I would recommend AVG over MSE any day.