You don’t need a personal IT staff or even a geeky family member to help keep your home computer safe from viruses, hackers, and other threats.
Microsoft offers the following free security tools and scans:
Downloadable software that helps protect against viruses, spyware, and other malicious software.
Web-based service that gives you quick, on-demand PC health and security scans to help you diagnose and solve problems in Windows 7 and Windows Vista. Also see the Windows Live Safety Scanner for Windows XP.
On Demand service that checks your computer for specific and prevalent strains of malicious software.
Get updates for your operating system and all of your Microsoft software, including Microsoft Office.