When trying to download Microsoft Security Essentials you got this message: Not available in your country or region ? Don’t worry, just point your browser to this address and you’ll get your download: http://www.microsoft.com/security_essentials/?mkt=en-us. I’ve been using AVG, Avast, Antivir and others for ages, but since there was lot of positive feedback on the net I’ve decided to give this all round Microsoft antivirus/antispyware/antimalware a chance. So far I like it. Small memory footprint, barely noticable. According to my expirience with this piece of software, I would recommend it as an healthy alternative to other free antivirus/antispyware combos. And yes, MSE replaces Windows Defender in Windows Vista and Windows 7.