Sad but true that the best Trojan removers are not necessarily the free ones.
In fact it's the ones that are free that you need to watch out for.
It's not that aren't some good ones, but a lot of them are actually black hat marketing techniques designed to hold ransom.
What they do, is actually install other Trojans and software on your computer besides the already installed malware that you're trying to get rid of.
Then they claim for a fee that they will remove all malware from your computer.
At this point how could you possibly believe them? It's often a never ending scheme to get more and more money from you.
In my opinion one of the better software is AdwareBOT.
AdwareBOT will do an initial scan of your computer at no charge and let you know what kind of issues you have in your system.
Whatever you do please do not ignore Trojans in your computer.
Did you know that most of the spam is delivered by people's computers at home? What these evil people do is they get Trojans installed on computers throughout the world in people's houses, and these computers to become robots that are controlled by these evil people.
These spam nets are then able to send out millions of junk e-mail through your grandma's computer, your hands computer, and possibly even your computer.
Even worse there are some Trojans that give these people access to all your personal information on them to steal your identity.
For your own safety please scan for Trojans on your computer using legitimate software.