List of anti-malware product removal tools

Anti-malware / Anti-Virus products often are not removed completely or properly when using “Programs and Features” (or “Add/Remove Programs”). It is possible that various services and/or drivers will still be active or installed, and will cause conflicts when another anti-malware product is installed. Therefore, you may have to use the manufacturer’s cleanup or removal tool to insure proper removal before you install Microsoft Security Essentials (MSE), or any other anti-malware product.

INFO : MICROSOFT 

UPDATE : MICROSOFT