Cannot Install Microsoft Security Essential, error 0x80070645

[top secret]

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,

 

[LuzTeTT]

Did you try restarting your computer?

 

[top secret]

yes

 

[LuzTeTT]

yes

Have you followed this Microsoft knowledge base article?
Error: 0x80070645 appears when you try to upgrade Microsoft Security Essentials

 

[top secret]

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.

 

[Layback Bear]

Make sure you don't have any other anti virus programs or 3rd party firewall blocking MSE.

 

[Borg 386]

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?

 

[top secret]

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?

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

 

[Jacee]

Make sure it's totally uninstalled Uninstalling MSE - Microsoft Community

 

[Layback Bear]

My dear lady Jacee what happen to your Avatar?

 

[Jacee]

My dear lady Jacee what happen to your Avatar?

??? what does it look like to you :shock:

 

[Layback Bear]

Send you a P.M.

 

[Layback Bear]

It's fixed.

 

[top secret]

Make sure it's totally uninstalled Uninstalling MSE - Microsoft Community

tried it, still the same

 

[Layback Bear]

This is a option. Take a good read through this and see if it is what you want.
http://www.sevenforums.com/tutorials/3413-repair-install.html

 

[Borg 386]

You could try running an SFC & see if that finds any problems

http://www.sevenforums.com/tutorials/1538-sfc-scannow-command-system-file-checker.html

Also, here is a MS Fix it tool for uninstalling MSE. You might want to try that & see if MSE installs after running this.

http://techdows.com/2010/11/microso...t-security-essentials-from-your-computer.html

 

[Layback Bear]

Okay top secret now would be a good time to make a list of what you have tried and what the out comes were. We are in the guessing stage until we have that information. You posted # 5 doesn't tell us what you tried.
Yes, I did. I have searched Microsoft web site, tried many solutions but did not work.

 

[Jacee]

I'm going to ask for two logs .... CKScanner and Security Check.
***NOTE: Run both of these apps as 'Administrator' by right clicking and choose to run as Administrator from the dropdown menu.

Download CKScanner by askey127 from HERE
Important - Save it to your desktop.
Doubleclick CKScanner.exe and click Search For Files.
After a very short time, when the cursor hourglass disappears, click Save List To File.
A message box will verify the file saved.
Double-click the CKFiles.txt icon on your desktop and copy/paste the contents in your next reply.

and

Download Security Check by screen317 from here http://screen317.spywareinfoforum.org/SecurityCheck.exe or here http://screen317.spywareinfoforum.org/
Save it to your Desktop.
Double click SecurityCheck.exe and follow the onscreen instructions inside of the black box.
A Notepad document should open automatically called checkup.txt.
Please post the contents of that document.

 

[GuillaumeGabard]

Delete Key in Registry

For Seven :
Remove registry key :
HKEY_CLASSES_ROOT > Installer > UpgradeCodes >26D13F39948E1D546B0106B5539504D9
For Windows XP :
HKEY_CLASSES_ROOT > Installer > UpgradeCodes > 1F69ACF0D1CF2B7418F292F0E05EC20B
And Install it !

 

[easypc123]

Security Essentials install !!SOLVED!!

For Seven :
Remove registry key :
HKEY_CLASSES_ROOT > Installer > UpgradeCodes >26D13F39948E1D546B0106B5539504D9
For Windows XP :
HKEY_CLASSES_ROOT > Installer > UpgradeCodes > 1F69ACF0D1CF2B7418F292F0E05EC20B
And Install it !

Cheers Gabard... although the Registry Keys were the other way around for me, I found the 26D13F..etc on the XP machine, deleting this allowed me to install so kudos.