When the trial runs out the software informs them that they have to renew their anti-virus software, which they do without any thought.
There are alternatives to retail versions of anti-virus software and is completely free. I am going to let you know what they are:
At HC Computers I advise people of such software as I personally use them myself. There are versions for businesses that require a fee but I will concentrate on home users first of all.
Microsoft Security Essentials is a free antivirus software created by Microsoft that provides protection against different types of malware, such as computer virus, spyware, rootkits and trojan horses.
Click to go to Microsoft Security Essentials website
PC Tools Antivirus provides basic antivirus and antispyware protection, with Smart Updates to keep your PC safe, File Guard to provide real-time protection and Email Guard to protect your computer from viruses and spyware being sent over email.
Click to go to PC Tools AntiVirus website
Threatfire Antivirus acts differently from other antivirus software. Instead of requiring a database to find a virus Threatfire looks at the files that have changed.
Click to go to Threatfire website
This is just a small example of antivirus software. Have a try of them and see if they perform well for you. These programs show you that you do not have to buy software to do a good job.