These days most computers come with a decent level of protection off the shelf, yet since threats change daily, it's imperative you keep it up to date or else it's useless.
Windows users can grab updates from Microsoft's dedicated website, but it's easier to set your computer to download them automatically - just go to Control Panel and click the 'System' icon, then go to the Automatic Updates section where you can toggle the latter on or off.
The same goes for dedicated anti-virus software (see the top free protection below); keep it up to date, and do a full system scan once a week.
Users of Apple Macs (and Linux) have slightly less to worry about in terms of viruses, as there still aren't so many floating about for them. Nonetheless, it's still recommended that Mac users grab anti-virus software too.
Users of Apple Macs (and Linux) have slightly less to worry about in terms of viruses, as there still aren't so many floating about for them. Nonetheless, it's still recommended that Mac users grab anti-virus software too.
