Since Vista,Windows Defender is included with Windows . It's a small piece of software that runs in the background to help protect ,your computer from malware (malicious software) like viruses, spyware, and other potentially unwanted software. Some spyware protection is better than none, and it's built in and free! But... if you are already running something that provides great anti-malware protection, defender will probably wasting precious resources , there's no need to have more than one application running at a time.

The problem with all Defender versions in Windows Vista and above is it's integrated into the operating system and installs by default with no visible or hidden option to uninstall. Many people are looking for ways to disable or remove it from their system as they prefer to use other software , for example on Windows 8 and 10 you cannot turn off Windows Defender completely anymore , A click on Settings in Windows Defender opens the control panel for the program in the new Windows Settings application. You can turn the program's real-time protection off temporarily, but if it's off for a while Windows will turn it back on automatically. It is unclear why Microsoft made the decision to change the behavior of Windows Defender in this regard. What is certain however is that it will annoy users who want to disable it permanently on the computer they are working on. Defender Control is a small Portable freeware which will allow you to disable Windows Defender in Windows 10 completely. Read more.