Microsoft have now moved this product out of testing and making it available for everyone to enjoy. I have tried the product on Vista and W7 32 and 64bit machines, all with positive results. So if your looking for a free AV alternative, that does what it says on the tin then this is certainly worth consideration.
I just wish they did a version for WHS
Microsoft Security Essentials provides real-time protection for your home PC that guards against viruses, spyware, and other malicious software.
Microsoft Security Essentials is a free* download from Microsoft that is simple to install, easy to use, and always kept up to date so you can be assured your PC is protected by the latest technology. Itâ€™s easy to tell if your PC is secure â€” when youâ€™re green, youâ€™re good. Itâ€™s that simple.
Microsoft Security Essentials runs quietly and efficiently in the background so that you are free to use your Windows-based PC the way you wantâ€”without interruptions or long computer wait times.
Check out the Microsoft Security Essentials Web Site to learn more,.