Ad-Aware Free Antivirus +
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Full user review
Considering it's free, it's a great product.
Nothing bad to say
It detects trojans. I had some trojans and it found them. I wouldn't rely heavily on real time protection anyways. You should scan any file that seems suspicious that enters your computer. The real time detection does find viruses. It's very low on memory, and doesn't slow your computer much. I used Lavasoft for a quite a long time. If ad-aware can't delete it for you, you can manually delete it. It healed my computer of the trojans though, so I didn't have to do that.
Fast, configurable, works with other security programs like Microsoft Essentials.