I like to save my money so that I can invest more in the stock market. So I use free software when I can. When I say free, I do not mean pirated software or software from torrents. I only use free software directly from the company or person that produced the software.
So here are a few I use to protect my computer:
Microsoft Security Essentials
I browse the internet using:
The one item I pay for is:
So far I have rarely been infected by any viruses or malware.