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Failure to connect to System Event Notification service

51953 Views 9 Replies 3 Participants Last post by  blues_harp28
I have a desktop computer running Windows 7 Home Premium 64-bit SP1. Yesterday, I installed uncropMKV (from w w and it installed AutoCompletePro. I followed the advice at - I uninstalled AutoCompletePro (using Revo Uninstaller), then ran AdwCleaner, Malwarebytes Anti-Malware Free, and HitmanPro.

Now, my computer boots slowly to an account with Admin privileges, but shows a bubble message, "Failed to connect to a windows service. Windows could not connect to the System Event Notification Service. This problem prevents limited users from logging on to the system. As an administrative user, you can review the System Event Log for details about why the service didn't respond." The computer now does not connect to the internet, and says, "Not connected. No connections are available" despite having both ethernet and wireless options. A Norton Internet Security scan is clean (but limited because there is no internet access).

Google reveals multiple posts about this problem, with multiple suggested fixes. For fear of making the problem worse, I have not tried any of the fixes, and I have not done a system restore. I would greatly apreciate some help. Thank you.

Tech Support Guy System Info Utility version
OS Version: Microsoft Windows 7 Home Premium, Service Pack 1, 64 bit
Processor: Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz, Intel64 Family 6 Model 42 Stepping 7
Processor Count: 8
RAM: 16367 Mb
Graphics Card: AMD Radeon HD 6900 Series, -2048 Mb
Hard Drives: C: 931 GB (345 GB Free); F: 1863 GB (1472 GB Free); H: 7451 GB (2603 GB Free); I: 3725 GB (2057 GB Free); J: 2794 GB (1582 GB Free); K: 5588 GB (2630 GB Free); L: 1862 GB (546 GB Free); M: 1862 GB (99 GB Free);
Motherboard: Gigabyte Technology Co., Ltd., Z68X-UD7-B3
Antivirus: Norton Internet Security, Enabled and Updated

# AdwCleaner v6.042 - Logfile created 09/01/2017 at 17:03:33
# Updated on 06/01/2017 by Malwarebytes
# Database : 2017-01-06.1 [Server]
# Operating System : Windows 7 Home Premium Service Pack 1 (X64)
# Username : User - USER-PC
# Running from : C:\Download\adwcleaner_6.042.exe
# Mode: Clean
# Support :
***** [ Services ] *****
***** [ Folders ] *****
***** [ Files ] *****
***** [ DLL ] *****
***** [ WMI ] *****
***** [ Shortcuts ] *****
***** [ Scheduled Tasks ] *****
***** [ Registry ] *****
[-] Key deleted: HKLM\SOFTWARE\Classes\protector_dll.Protector
[-] Key deleted: HKLM\SOFTWARE\Classes\protector_dll.Protector.1
[-] Key deleted: HKLM\SOFTWARE\Classes\protector_dll.ProtectorLib
[-] Key deleted: HKLM\SOFTWARE\Classes\protector_dll.ProtectorLib.1
[#] Key deleted on reboot: [x64] HKLM\SOFTWARE\Classes\protector_dll.Protector
[#] Key deleted on reboot: [x64] HKLM\SOFTWARE\Classes\protector_dll.Protector.1
[#] Key deleted on reboot: [x64] HKLM\SOFTWARE\Classes\protector_dll.ProtectorLib
[#] Key deleted on reboot: [x64] HKLM\SOFTWARE\Classes\protector_dll.ProtectorLib.1
[-] Key deleted: HKCU\Software\Microsoft\Windows\CurrentVersion\Ext\Stats\{FFE66D00-A56A-4F7F-81D7-4A28C5816D6C}
[-] Key deleted: HKU\S-1-5-21-1184989452-1369434558-4030354559-1000\Software\Conduit
[-] Key deleted: HKU\S-1-5-21-1184989452-1369434558-4030354559-1000\Software\MPC
[#] Key deleted on reboot: HKCU\Software\Conduit
[#] Key deleted on reboot: HKCU\Software\MPC
[-] Key deleted: HKLM\SOFTWARE\Conduit
[#] Key deleted on reboot: [x64] HKCU\Software\Conduit
[#] Key deleted on reboot: [x64] HKCU\Software\MPC
[-] Key deleted: HKU\S-1-5-21-1184989452-1369434558-4030354559-1000\Software\Microsoft\Internet
[#] Key deleted on reboot: HKCU\Software\Microsoft\Internet
[#] Key deleted on reboot: [x64] HKCU\Software\Microsoft\Internet
[-] Key deleted: HKLM\SOFTWARE\Classes\AppID\BHO.DLL
[-] Value deleted: HKLM\SOFTWARE\Mozilla\Firefox\Extensions [[email protected]]
[#] Value deleted on reboot: HKLM\SOFTWARE\Mozilla\Firefox\Extensions [[email protected]]
[#] Value deleted on reboot: HKLM\SOFTWARE\Mozilla\Firefox\Extensions [[email protected]]
***** [ Web browsers ] *****
:: "Tracing" keys deleted
:: Winsock settings cleared
C:\AdwCleaner\AdwCleaner[C0].txt - [2589 Bytes] - [09/01/2017 17:03:33]
C:\AdwCleaner\AdwCleaner[S0].txt - [2736 Bytes] - [09/01/2017 17:02:42]
########## EOF - C:\AdwCleaner\AdwCleaner[C0].txt - [2735 Bytes] ##########
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Have you tried the following?
Click on Start
In the seach line.
Press Enter.

Once in Services.
Scroll down to System Event Notification Service
Next to Startup type > Click on the drop down menu.
Select Automatic
Click Apply > Ok.

Make no other changes while in services.
Restart your Pc.
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blues_harp28, Thank you for helping!

In Services, System Event Notification Service (SENS) was already set to "Automatic", but even after an hour the status was "Starting" (when the other automatic services said "Started").

I tried setting SENS to "Disabled", rebooted, set SENS back to "Automatic", and rebooted again - but this didn't work: [1] I still get the error message "Failed to connect to a windows service, etc", [2] the computer cannot connect to the internet ("No connections are available"), [3] when booting, it takes about 5 minutes from when I enter the password until the desktop appears (much longer than usual), and [4] non-administrator users cannot log on.

The error message says, "You can review the System Event Log for details about why the service didn't respond". This is not true, of course, because the System Event Notification Service is not working so the System Event Log is empty (Catch 22).

Thank you again for taking the time to help me. It is greatly appreciated.
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Run System File Checker.
Click on Start - Search - Type cmd
Right click on cmd.exe - select Run as Administrator.
At the Command Prompt - Type
sfc /scannow
Press Enter.
Let it run to completion - but do not close the cmd window.
To save the log file.
Copy and Paste the following in Command Prompt.
findstr /c:"[SR]" %windir%\logs\cbs\cbs.log >%userprofile%\Desktop\sfcdetails.txt
Press Enter
On your desktop you will see a text file called sfcdetails.txt
Download Junkware Removal Tool - using another pc if you have to.

Temporarily shutdown your anti-virus to avoid any conflicts.
Be sure to enable the anti-virus program after the scan.

Right-mouse click JRT.exe and select Run as administrator (If using XP just double click on the icon to run it.)
The tool will open and start scanning your system.
Please be patient as this can take a while to complete.
It will shutdown your desktop and restart your pc - allow it to do so.
On completion, a log (JRT.txt) is saved to your desktop and will automatically open.
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I have followed your instructions carefully, but unfortunately the problems persist.

I attach sfcdetails.txt (no errors found) and JRT.txt. Please let me know if you prefer me to copy and paste log files into the body of my messages.

Thank you again for helping.


I edited post 1 to remove link to the infection. We don't want any other user accidentally infecting themselves
Thanks. My apologies for including the link.
Download Windows Repair (All In One)

Click on Repairs in the top toolbar.
Then Open Repairs.
After you click Open Repairs - it will automatically make a back up of the registry.

Untick all entries and one at a time put a check mark in the following.

1. Reset Registry Permissions
10. Remove Policies Set By Infections
13. Repair Network
27. Set Windows Services To Default Startup

Click on Start Repairs.
If the above does not work run again in Safe Mode with Networking.


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Success! Thank you very much indeed!

I've made a donation. It is wonderful that people like you are prepared to help complete strangers living on the other side of the world solve computer problems - it reaffirms my faith in humanity.
Anytime, happy to be of some help. (y)

Registry backup program. Well worth installing
Registry files will be saved to Local Disk [C:] RegBackup.
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