The Free Version (Not Trial) will protect you for 1 year.
Avast Anti-Virus
Protect your devices with the best free antivirus on the market. Download Avast antivirus and anti-spyware protection for your PC, Mac and Android.
When you think you may be infected - I choose the Free Version to get you clean. Click "NO" to anything that says Trial.
Malware Bytes
Multiple layers of malware-crushing tech. Smarter detection. Specialized ransomware protection.
Cleans all the "Crap" off of your device...
And the Free version is Awesome!!
CCleaner
Developed by Piriform, is a utility program used to clean potentially unwanted files and invalid Windows Registry entries from a computer.
A Great tool to uncheck things like Mcaffee, Toolbars, and other programs that get installed when you are simply trying to get the latest JAVA or Flash.
UnChecky
Unchecky aims to keep potentially unwanted programs out of your computer.