What security software do I need to have installed on my computer?
What is the best security software available for my computer?
What is the best free security software?
Where can I download free anti-virus software?
Where can I download free anti-spyware software?
Where can I download free a free firewall?
The makeuseof.com article includes descriptions and links for the following FREE programs:
AVG Anti-Virus (Windows)
MalwareBytes Anti-Malware (Windows)
Spyware Terminator (Windows)
Comodo Firewall Pro (Windows)
NoScript - Firefox
Lastpass (Firefox / Internet Explorer)
WOT (Web Of Trust) - Firefox
I personally use Comodo Firewall and MalwareBytes anti-malware software. For anti-virus software I use the free version of Avast, which you can register for here.