Download Windows Live OneCare
Windows Live OneCare is a powerful and helpful tool to keep your system protected from any attack, viruses, hackers, spyware and suspicious behavior that your system may have. It's user friendly and easy to manage.
It doesn't consume a lot of system resources so you don't have to worry about your computer crashing or working improperly. it also updates constantly.
It has extra features such as: multi-PC and home network management, printer sharing, start time optimizer, WIFI security and on-line photo backup.
This is a trial version of 90 days worth to try and buy. You'll be surely amazed by its great performance.