We strongly recommend that all internet users protect themselves against virus and hackers on the internet.
For Anti-Virus software, we recommend Grisoft's AVG software. They even have a free version that works extremely well.
Their website is http://free.avg.com/us-en/download-avg-anti-virus-free
For protecting your computer against unwanted intrussion, we recommend ZoneLabs' ZoneAlarm. They also have a free version. Their website is http://www.zonelabs.com