It will make your life a whole lot easier. Anti-virus software . Since before the Internet, there have been computer viruses. The difference being a virus 'infects' but one machine. It replicates itself and looks for ports to further transmit itself.
Worms are definitely far worse than a virus.
To enhance the security of your PC from such pusillanimous rot, a good anti-virus program is a must. However, just having a anti-virus program installed on your machine is not enough. You need to keep the anti-virus definition file up to date. Some manufacturers offer this gratis. Some charge a small fee.