PCs are hijacked when users download and install software containing malicious code which takes over their computer. Such software, called "malware", often appears to be safe, but users should ensure that they only obtain software from trustworthy sources, and that they scan it before installing with an up-to-date antivirus solution.  Computers can also be hijacked just by connecting them to the internet, as we discussed last month, so users should also make sure that they are using a good firewall solution.

Here are some top tips to stay safe online:

* Install anti-virus software and make sure you keep it up-to-date
* Install a personal firewall and/or ensure your operating system's firewall is on
* Use Windows and Apple updates to patch security holes
* Do not open e-mail messages that look suspicious
* Do not click on e-mail attachments you were not expecting
* Take time to educate yourself and family about the risks
* Monitor your computer and stay alert to threats