As an experienced PC user you almost certainly have an antivirus tool already, but does it really deliver the features and performance you need? If not, then we've a first-rate alternative in AVG Anti-Virus 7.5 Professional Edition, that's packed with reasons why you should choose it ahead of the competition.

It all starts with a compact antivirus engine that won't swallow all your system resources. Our test PC saw the major AVG Anti-Virus components consume only around 4 MB of RAM when running in the background, for instance, and CPU utilisation is also very low, so most of the time you'll never even know the program is there. This is also one of the few antivirus programs to remember that there was life before XP, and it'll still run happily on old Windows 98 or Me systems.

The efficient approach pays off in scanning performance, with AVG Anti-Virus able to check your entire system at a very reasonable speed. Although if even that's not fast enough, you could set up a custom scan that would run much more quickly. The default System Areas Test, for example, checked commonly infected areas on our test PC in under 5 seconds.

Of course the real aim of AVG Anti-Virus is to prevent you getting infected in the first place, and so the program's Resident Shield looks for and blocks threats before they can be launched. It will scan your incoming and outgoing mail, too, and you can also schedule further scans to trap anything that manages to get by.

Best of all, this isn't one of those miserly trial editions that expire after 15 minutes. Install this version of AVG Anti-Virus 7.5 Professional Edition and it'll carry on protecting your PC for a very generous 12 months.

Upgrade to AVG Internet Security and you'll gain a cutting-edge antispyware engine, a firewall that monitors both incoming and outgoing Internet connections, and an accurate spam filter that works with all the main e-mail clients (and quite a few of the obscure ones, too). Real-time protection keeps an eye on every file you open, save or execute, and a powerful scheduler lets you scan your choice of system areas at the times you need. Upgrade for only £34.99 rather than £44.99 from www.avguk.com/vnu7 using promotion code vnu7. This upgrade offer will expire 29th of February 2008.