Microsoft's much hyped, and long anticipated, Windows Vista operating system is now available, and here we review some of the main new features.

Vista comes with a completely new look and is far more stable and secure than XP at launch. However, we'd advise people think carefully before upgrading. Using Microsoft's Window's Upgrade Advisor tool will tell you whether your hardware is up to scratch, and indicate potential problems with software programmes and peripherals you use.

It's then a case of deciding which version, and we think the Home Premium will suit most people. Basic is a little too, well, basic and at £250 for the upgrade and £325 for the full boxed version, Ultimate is likely to be out of the price range many are prepared to pay.

As for whether you should upgrade an XP machine, it depends on the type of user you are. Novices, anyone with a single PC they rely on and hardcore gamers are probably better of holding back for a couple of months, while some driver support issues are finalised. But if you're an expert, or have more than one PC, then Vista is a worthwhile upgrade.

You can also read a more in-depth review of Windows Vista on PCW.

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