Best Software for Clearing spyware

[Compman15]

What is the best FREE software out there that will make sure I have no spy ware on my comp back door trojans on my comp?

Thanks

[The Dude]

Ad-aware is a good free program to remove spyware. Don't forget to download the Ref file updater too.
http://www.lsfileserv.com/

[YeOldeStonecat]

Ad Aware

Pest Patrol <==a bit better at trojans...meant to get them more than Ad Aware, which is more towards spyware.