Windows 7 Forums
Welcome to Windows 7 Forums. Our forum is dedicated to helping you find support and solutions for any problems regarding your Windows 7 PC be it Dell, HP, Acer, Asus or a custom build. We also provide an extensive Windows 7 tutorial section that covers a wide range of tips and tricks.


Windows 7: Cannot Install Microsoft Security Essential, error 0x80070645

25 Oct 2012   #1

Windows 7 Home Premium 32bit
 
 
Cannot Install Microsoft Security Essential, error 0x80070645

Hello,

My problem is with Microsoft Security Essential (MSE). I had some problems with Security Client while installing windows updates, which causes the updates not to be installed. Searching the Internet, I found that I have to re-install MSE. I tried to uninstall it. I got error about (epp.msi) cannot found, so I used "Let me fix it" tool from Microsoft to uninstall it. Succeeded to uninstall it, I tried to install it again; however, I got Error 0x80070645 [attached the pic.]

I hope you can help. Thanks,



Attached Images
 
My System SpecsSystem Spec
.

25 Oct 2012   #2

Windows 8 Pro x64
 
 

Did you try restarting your computer?
My System SpecsSystem Spec
25 Oct 2012   #3

Windows 7 Home Premium 32bit
 
 

yes
My System SpecsSystem Spec
.


25 Oct 2012   #4

Windows 8 Pro x64
 
 

Quote   Quote: Originally Posted by top secret View Post
yes
Have you followed this Microsoft knowledge base article?
Error: 0x80070645 appears when you try to upgrade Microsoft Security Essentials
My System SpecsSystem Spec
25 Oct 2012   #5

Windows 7 Home Premium 32bit
 
 

Quote   Quote: Originally Posted by LuzTeTT View Post
Quote   Quote: Originally Posted by top secret View Post
yes
Have you followed this Microsoft knowledge base article?
Error: 0x80070645 appears when you try to upgrade Microsoft Security Essentials
Yes, I did. I have searched Microsoft web site, tried many solutions but did not work.
My System SpecsSystem Spec
25 Oct 2012   #6

Windows 7 Pro. 64/SP-1
 
 

Make sure you don't have any other anti virus programs or 3rd party firewall blocking MSE.
My System SpecsSystem Spec
25 Oct 2012   #7

Win 7 32 Home Premium, Win 7 64 Pro, Win 8.1 Pro
 
 

Something I read in an article a while back said that if you are already infected with a virus, MSE may not install. It might be wise to run a scan with Malwarebytes or another AV Scanner (SuperAntiSpyware, Windows Defender Offline) just to confirm your system is clean.

Also, as Layback Bear mentioned, do you have any other AV's or Security software installed on your PC?
My System SpecsSystem Spec
25 Oct 2012   #8

Windows 7 Home Premium 32bit
 
 

Quote   Quote: Originally Posted by Borg 386 View Post
Something I read in an article a while back said that if you are already infected with a virus, MSE may not install. It might be wise to run a scan with Malwarebytes or another AV Scanner (SuperAntiSpyware, Windows Defender Offline) just to confirm your system is clean.

Also, as Layback Bear mentioned, do you have any other AV's or Security software installed on your PC?
Quote   Quote: Originally Posted by Layback Bear View Post
Make sure you don't have any other anti virus programs or 3rd party firewall blocking MSE.
I did a scan and found nothing. I have only Malwarebytes installed only right now. And MSE was the first antivirus in my PC
My System SpecsSystem Spec
25 Oct 2012   #9
Microsoft MVP

Windows 7 Ultimate 32bit SP1
 
 

Make sure it's totally uninstalled Uninstalling MSE - Microsoft Community
My System SpecsSystem Spec
25 Oct 2012   #10

Windows 7 Pro. 64/SP-1
 
 

My dear lady Jacee what happen to your Avatar?
My System SpecsSystem Spec
Reply

 Cannot Install Microsoft Security Essential, error 0x80070645




Thread Tools



Similar help and support threads for2: Cannot Install Microsoft Security Essential, error 0x80070645
Thread Forum
Solved Microsoft Essential Problem System Security
Solved Microsoft Security Essential not UPDATING Windows Updates & Activation
Solved I can't install Microsoft Security Essentials System Security
Solved MSE ( Microsoft Security Essential ) Problem System Security
ms security essential full scan System Security
Microsoft Security Essential System Security
MS Security Essential Install error 0x80070643 Software

Our Sites

Site Links

About Us

Find Us

Windows 7 Forums is an independent web site and has not been authorized, sponsored, or otherwise approved by Microsoft Corporation. "Windows 7" and related materials are trademarks of Microsoft Corp.

Designer Media Ltd

All times are GMT -5. The time now is 11:41 PM.
Twitter Facebook Google+



Windows 7 Forums

Seven Forums Android App Seven Forums IOS App
  

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33