Most computers come bundled with a free anti-virus solution, but sooner or later you will find out its just a trial and will eventually need to pay for the service. When your trial expires you leave your computer open and exposed to potential viruses.
In todays world no one is ever 100% completely safe even with the most sophisticated protection. This is why having at least some kind of protection is very important. Whether it be some kind of free anti-virus software or a paid version. For those of you who don’t have the proper funds or desire to maintain a subscription I highly recommend using one of the following free anitvirus versions.