Without security software your computer's in danger from hackers, viruses, spyware and spam. Data could be corrupted or destroyed, passwords or credit card numbers stolen from your system or your internet connection could be hijacked.

You need to protect your computer - either with a single product (a security suite) or a combination of separate products.

Suites vs individual components

The advantage of a security suite is its ability to protect with just one product - you only have to learn one program. A suite also reduces software conflicts between different programs. However, it can be let down by one poor component, and loading more software to fix this may conflict with the suite.

Choosing standalone components requires four products. There are free products,  but you won't receive manufacturer support. The savings may be worth the hassle for intermediate or advanced users.

What to look for

If you're considering buying a security suite, here are the features to look for: 

Update cost

Regular updating is essential. Updates can be downloaded from the manufacturer's website. Find out whether there's an extra cost for this. Some products offer free updates for the first year, then charge an annual fee. Others supply free updates indefinitely.

Blocking

• Pop-up blocking stops pop-up windows from loading. These windows often contain adware or viruses.
• Ad-blocking stops images and scripts typically used in advertising.
• Cookie-blocking stops small text files containing information being allowed into your computer.

Content filtering

Also known as parental control software, this allows websites to be blocked using whitelist, blacklist, or heuristic controls. For more information, see our test of net filtering software.

Identity theft and phishing protection

Phishing sites are designed to look like legitimate websites such as banks or online shops in the hope you will enter your credit card or bank details. Many security suites block sites known to be involved in phishing or identity theft.

Instant Messaging (IM) protection

Detects viruses contained in messages sent using tools such as Yahoo Messenger or MSN Messenger.

WiFi protection

Allows you to manage your wireless security and detect any unauthorised access. This feature may only work with certain brands and models of wireless routers.

Game mode

Allows playing games or viewing entertainment over the internet while maintaining security. This can activate automatically when launching an online service and does not interrupt or impact the service.

Help

Decide what level of support you need. Most security suites have comprehensive help functions, tutorials, and online assistance. But if things go wrong, is email contact enough or would you prefer personal assistance via a helpline? Don't assume a helpline is free, even if it uses an 0800 or 0508 number. You may have to pay for support and assistance.

Scan on install

Ideally, you'll be installing your new software on a virus-free and spyware-free computer. If not, look for software that scans your computer before it installs, or one that updates and scans immediately after installation.

Remote file check

Allows you to send a copy of a suspected infected file to the software developer's lab for diagnosis.

Scheduled scan

The software can be set to scan specified folders or files at regular times.

Archive scan

Downloaded files are often compressed or archived to save space. Archiving hides the properties of the threat the security software looks for. This special scan finds them.

System slowdown

Security suites are notorious for slowing down your computer - and some are worse than others. We hear of many consumers loading system-hungry security programs on to older machines that then grind to a standstill. Some users are so frustrated they end up removing the suite:  that’s money down the drain and it exposes your computer to risk.

Before you buy:

• Check the suite's minimum system requirements. If your PC only just meets those, look for something else.
• Some manufacturers offer free downloadable limited-time trial versions. This can give a good indication of what effect the suite will have on your computer’s performance.