Yes, Kaspersky completely ravages any computer within minutes, which is why it's one of the most popular anti-virus programs available...
I know it's a bit hard to tell online, so if you can't tell, I'm being terribly sarcastic. If this computer "expert" actually said that, then he is a complete idiot. AVG is a good alternative because it's free, but I assure that Kaspersky is highly trusted and considered by many to be one of the best anti-virus programs available. If I were you, I would go ahead and stick with AVG because it should give you ample protection. However, I would not stick with that so-called expert.