Do I need Windows Defender on if I have Avast Anti-Virus?

I figured having Windows Defender would just slow down my computer and besides that, I do have Avast Anti-Virus on my computer and its running and up to date. I have an older computer 2009-2010 model ( Sony VAIO, Windows Vista ), so I am really trying to watch what I NEED running and what I DON'T need running.

P.S.- I am running Avast! FREE Edition ( So basically this is only the bare minimum protection for the Avast! Anti - Virus Program )
I thought I should conclude this ^^ Statement so you could further determine what is the best answer for me.

Thanks for any help, it is very much appreciated! :]




Answer
Answer

Hello TriciaKnight,

You don't need both on your system. You only need one anti virus application. Regardless of which third party (i.e., not Microsoft) anti virus application you choose it will always turn Windows Defender off to prevent conflicts. In answer to your question "will it cause a conflict between defender and avast running simultaneously" the answer is Yes it will.

This forum post is my own opinion and does not necessarily reflect the opinion or view of Microsoft, its employees, or other MVPs.

 

John Barnett MVP: Windows XP Associate Expert: Windows Experience: www.winuser.co.uk | vistasupport.mvps.org | xphelpandsupport.mvps.org | www.silversurfer-guide.com

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You are welcome, Patrick.

It is a pity Microsoft still kept the name Windows Defender for use in Windows 8; it does cause a lot of confusion.

 

Here are the links explaing the difference:

http://www.microsoft.com/security/pc-security/windows8.aspx

 

In Windows 8, Windows Defender replaces Microsoft Security Essentials. Windows Defender runs in the background and notifies you when you need to take specific action. However, you can use it anytime to scan for malware if your computer isn’t working properly or you clicked a suspicious link online or in an email message.

 

And this is for Windows Defender in Vista and Windows 7:

http://windows.microsoft.com/en-us/windows/turn-windows-defender-on-off#turn-windows-defender-on-off=windows-7

 

When Windows Defender is on, you're notified when spyware or other potentially unwanted software tries to install itself or run on your computer. If you use the default settings, Windows Defender also checks for new definitions (files that are used to determine if software is spyware) and automatically removes any detected item that has a recommended removal action.

 

It is almost as bad as confusion between Office Outlook and  the new Outlook.com replacing Hotmail. :)

 

Cheers.

___________________________________________________

Bill Smithers - Microsoft MVP July 2013 - Dec 2020

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Last updated September 10, 2020 Views 118,718 Applies to: