Online threats are constantly changing so the tools needed to protect a computer also need to adapt. Computeractive has teamed up with F-Secure to offer 20 winners a copy of F-Secure Internet Security 2010 each.

F-Secure Internet Security 2010 includes tools to defend against viruses, spam and fraudulent websites.

There's good news for owners of older PCs and low-powered netbooks too, Internet Security is 60 per cent faster and uses 70 per cent less memory than the previous version. The look of the computer has been completely designed to be easier to use and to find the right task.

A toolbar program is installed in Internet Explorer and Firefox that checks websites for problems or malicious attacks.

Internet Security updates its list of known malware automatically. It also uses a new technology called Deep Guard that compares the experiences and decisions of other users to decide if software can be allowed to run. This helps it protect against malicious software that has not yet been analysed. A human decision always takes priority if it is available.

For your chance to win this security software, answer the question shown below before 12 November 2009. For more information visit www.f-secure.co.uk.