Update your computer

On Tuesday, Microsoft will issue five security patches, including some for Internet Explorer that are rated critical. To get them, run Windows Update from the Start menu. It will scan your system and show a list of the patches. Install all critical patches. You may need to restart your computer afterward.

There are also software updates for both the PowerPC and Intel chip Macs. Download them by running Software Update. You can find it by going to the Apple menu in the upper left.

It's a good idea to update your system but running these once a week.