The Windows Security Center is worth a regular visitto ensure that your PC has all the necessary protections in place. In Windows Xp, open the Start menu, then click Control Panel followed by the Security Center link.

In Vista,open Control Panel in the same way but then c1ickthe'Check this computer's security status' link under the Security heading. If any of the main sections indicate a problem, as in our screenshot, use the various buttons and help links to investigate and resolve the problem.