As soon as you get a computer, download the top free Malware protector. Yeah, I know the computer comes with some Anti-virus program. Fine. Download another.
Run the one that came with your computer, (which expires in 30 days unless you pay for it). Now run the new program.
In some cases there will be a conflict. Fine. There are other Malware detectors which will work.
One always tries to have two different Malware programs that can be run in tandem, because what one misses, the other will catch.
As soon as the pre loaded virus detector expires, delete it.
Change your protectors often. Never sit down on one malware detector. Constantly monitor the latest detectors. Try them, change them, be aware of danger at all times.