Microsoft Security Essentials (MSE), Microsoft’s free home user anti-malware tool, was today released in all it’s final glory to the world at large.
I’ve been running the beta for a few months now and I find it to be brilliant…it’s easy to install, easy to use, un-obtrusive and hasn’t let any nasties through (touch wood!). I was a Kaspersky user previously but I started to have some issues with the Windows 7 RC so MSE came along at just the right time 🙂 I’d definitely recommend that you give it a go, so download it from:
http://www.microsoft.com/security_essentials/
For more in-depth info and screenshots-see my July post here.
Cloudy with a chance of Licensing 
MSE is probably good only if you want to run it with Windows 7. I have tried it on Windows XP and it had far too many issues. I found Panda Cloud Antivirus to be much better in this case on Windows XP. Unfortunately, Panda does not run on Windows 7 and therefore, am using MSE on it…
But, I must congratulate if you have not had any issue with MSE…I guess you are a lucky user…