Microsoft offers a free service which will automatically update your operating system and any related software as soon as updates and patches are available. The status is checked every time the PC is switched on, as long as you’re using a genuine copy of Windows.
F-secure have also produced a free health check product which will check all of the software products which are loaded on your PC, and will let you know if any are out of data or require security patches. It’s a good idea to run this product at least once a month. It’s available via the useful links section of our website.