Is (Windows Defender) compatible with (Microsoft Security Essentials)? I know both of these programs operate with (update definitions). My anti-virus (subscription) will make (3) programs I have installed, for (malware, spyware & virus) on the PC. Should I (disable) Windows defender while updating (Microsoft Security Essentials) for operating ? I have reports of possible (conflictions), when (2) or more anti-virus programs are installed. Also: Theres my (download security alert). I've had to cancel (2) important downloads with common sense, when Microsoft Security Essentials ''detects'' a incoming trojan with a download in progress. My count with (Trojan:JS/Redirector.JA) is now (98) attacks to date, with (no-end) in sight. I already have to watch the PC system, of the ''slightest'' deviation from stablility. Lee Payne