You want a good, solid, free antivirus program? Microsoft Security Essentials fills the bill nicely. Unfortunately, even though it was officially released more than a year ago, it’s still one of the best-kept secrets in personal computing. Its installed base of 30 million users worldwide might sound big in raw numbers, but it’s a drop in the bucket compared to the billion-plus Windows PCs in use.
All that’s about to change, as Microsoft has now begun delivering Microsoft Security Essentials via Microsoft Update to customers in the United States (a pilot program in the UK started earlier this year). If Windows detects that you’re currently running without up-to-date antivirus protection, this is what you’ll see in the Optional Updates section: