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Windows 7: Do I need Win Defender if I use Avast Free AV?

15 Dec 2009   #1
donnyb

Win 7 x64
 
 
Do I need Win Defender if I use Avast Free AV?

The title says it all. I am actually using both without issue. Well, I do have one small issue and that is that WD pops up with a message at boot up that it has not been started. I think I can fix that by going into Services and have it start automatically with a delay. But do I really need both? I am using W7-64.


My System SpecsSystem Spec
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15 Dec 2009   #2
Tews

64-bit Windows 8.1 Pro
 
 

Believe it or not there are some threats that a program like Defender will catch that an Anti Virus may miss... With system security, you dont want to take any chances... Use both!
My System SpecsSystem Spec
15 Dec 2009   #3
Jacee
Microsoft MVP

Windows 7 Ultimate 32bit SP1
 
 

You can disable it, but these two security apps are my personal 'must haves' ....
SpywareGuard and SpywareBlaster by Javacool.

SpywareBlaster needs to be updated (manually) about once a week or so. You also have to remember to click "protect against all".
Javacool Software
My System SpecsSystem Spec
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15 Dec 2009   #4
Dinesh

Windows® 8 Pro (64-bit)
 
 

hi I use avast 5 beta with malware bytes.
IMO, WD is useless..
My System SpecsSystem Spec
15 Dec 2009   #5
Tews

64-bit Windows 8.1 Pro
 
 

+1 for Malware Bytes
My System SpecsSystem Spec
15 Dec 2009   #6
Brink
Microsoft MVP

64-bit Windows 10 build 10122
 
 

Quote   Quote: Originally Posted by donnyb View Post
The title says it all. I am actually using both without issue. Well, I do have one small issue and that is that WD pops up with a message at boot up that it has not been started. I think I can fix that by going into Services and have it start automatically with a delay. But do I really need both? I am using W7-64.
Hello Donny,

I would recommend to use both as well. However, you might install Microsoft Security Essentials. It will turn off Windows Defender and be used instead. I use this and Avast without any issues in Windows 7.

Hope this helps,
Shawn
My System SpecsSystem Spec
15 Dec 2009   #7
jav

Windows 7 Ultimate x86 SP1
 
 

Quote   Quote: Originally Posted by Brink View Post
Hello Donny,

I would recommend to use both as well. However, you might install Microsoft Security Essentials. It will turn off Windows Defender and be used instead. I use this and Avast without any issues in Windows 7.

Hope this helps,
Shawn
I understand that having 2 AV is good in a way, if one misses second will catch etc.
And I believe that there may not be any issues between them (which is very good)

But isn't it a bit overkill?
I mean, probably both of them have on-access scanners (which is from detection point of view nice but It should double your time to access files as firstly it should be scanned by both of them)
It will be significant hit while using application which demand high resources or access lots of files.
For example gaming, It's already Hell to have one on-access scanner but two of them probably make your gaming experience terrible.

Or even for casual users: Internet surfing.
Every temporary file created/accessed by your browser will be scanned by one AV and then second one.

Or while putting one of them on full scan (of course in this case you can disable second one for some time)

But, it's just a theory.
And I am asking you (as a person who already uses this setup), do you experience any performance drawbacks or things like that?
My System SpecsSystem Spec
15 Dec 2009   #8
Brink
Microsoft MVP

64-bit Windows 10 build 10122
 
 

Jav,

I have not seen any performance decrease at all on my system, but this will vary depending on your system. You may see a slight decrease in performance. If so, you can always just uninstall one of them.

Normally you would only want to have one antivirus program installed at a time to avoid them conflicting with each other, but both Avast and MSE have been designed to work together without a problem.
My System SpecsSystem Spec
15 Dec 2009   #9
gamepro127

Windows 7 Enterprise x64
 
 

This is how Real-Time Scanning work

FILE F:\EXAMPLE.EXE WANTS TO TRANSFER TO C:\EXAMPLE.EXE
SCANNING EXAMPLE.EXE....
EXAMPLE.EXE: CLEAN!
EXAMPLE.EXE ALLOWED TO COPY TO C:\

Thats one antivirus/antispyware

Two:
SCANNING EXAMPLE.EXE....
EXAMPLE.EXE: CLEAN!
(2)
SCANNING EXAMPLE.EXE....
EXAMPLE.EXE: CLEAN!
EXAMPLE.EXE ALLOWED TO COPY TO C:\

You can see the slowdown...
Each file loaded into system memory, copied from one device or another or when another program tries to accesses the certain file, the antivirus must scan it first before allowing it to do so.
Now Two Antiviruses/antispyware...Well both programs must scan it first.
My System SpecsSystem Spec
15 Dec 2009   #10
jav

Windows 7 Ultimate x86 SP1
 
 

Quote   Quote: Originally Posted by Brink View Post
Jav,

I have not seen any performance decrease at all on my system, but this will vary depending on your system. You may see a slight decrease in performance. If so, you can always just uninstall one of them.

Normally you would only want to have one antivirus program installed at a time to avoid them conflicting with each other, but both Avast and MSE have been designed to work together without a problem.
ok, thank you
But I am not using Avast as my main AV, so maybe for future reference.
Thank you anyway
Quote   Quote: Originally Posted by gamepro127 View Post
This is how Real-Time Scanning work

FILE F:\EXAMPLE.EXE WANTS TO TRANSFER TO C:\EXAMPLE.EXE
SCANNING EXAMPLE.EXE....
EXAMPLE.EXE: CLEAN!
EXAMPLE.EXE ALLOWED TO COPY TO C:\

Thats one antivirus/antispyware

Two:
SCANNING EXAMPLE.EXE....
EXAMPLE.EXE: CLEAN!
(2)
SCANNING EXAMPLE.EXE....
EXAMPLE.EXE: CLEAN!
EXAMPLE.EXE ALLOWED TO COPY TO C:\

You can see the slowdown...
Each file loaded into system memory, copied from one device or another or when another program tries to accesses the certain file, the antivirus must scan it first before allowing it to do so.
Now Two Antiviruses/antispyware...Well both programs must scan it first.
That's exactly what I meant!
My System SpecsSystem Spec
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 Do I need Win Defender if I use Avast Free AV?




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