Well these are the top 6 free antivirus applications currently. Choose the one that best suits you.
Always keep these things in mind :
Never try to open the links in the spam mail.
All those mails which you get saying you won money, gifts etc are all malicious and could virtually screw up your computer.
Do not ever click on suspicious ads or links.
If you see “Your IP has been selected for this gift” or any other such ads, never ever click on them.
And most important of all, update your antivirus regularly.
Just because you have an antivirus installed, it doesn’t mean that you can do anything on the Internet, always keep an eye on your antivirus to see whether it is up-to-date.