Make sure that your PC or Mac has the latest operating system patches installed.
This information about antivirus updates applies primarily to personally-owned, non-ITS-managed computers. There are several companies that provide free antivirus software. Also, be sure to schedule a periodic scan of your computer (scheduled to run at least once a week). Being up to date includes the AV software itself and the signatures. Make sure you are running up to date antivirus (AV) software whether on a PC or Mac (yes, definitely Macs too).
The following about antivirus and operating system updates applies primarily to personally-owned, non-ITS-managed computers.