Failure to connect to System Event Notification service (V2)

Sorry, I know that a thread already exist with the Title "Failure to connect to System Event Notification service".
But having tried everything in the thread and without any success, I decided that it was important to post the solution that fixed the problem in my case.
I had the problem with Windows 7.
After many hours trying anything I found on the web, I was being reinstalling my BitDefender AntiVirus.
(Because I uninstalled is to allow me to perform a System Restore to a date before the problem occured)
Anyway my System Restore did not work.
Then, while I was reinstalling BitDefender, the problem was still there...
But during the re-installation of BitDefender, the installer told me that I should uninstall MalwareBytes because it could cause conflicts. So I did.
Then after rebooting, and the problem was gone at the next login and then BitDefender finalised it's installation.
So, I strongly believe that it was solved by uninstalling MalwareBytes.
Now, after 4 reboots, I don't see the problem anymore.

 

There are two types of malwarebytes, the free and pro versions. Even the free version wants to install initially as a pro trial which means it's an active scanner rather than on demand like the free version is supposed to be. Having more than one active virus or malware scanner installed at one time can cause problems, but you can have any number of on demand scanners installed at the same time as your one active scanner since they only run if you ask them to (on demand).

I have seen programs like that ask if you want to install the pro trial and even if you opt out they still install certain files so you can activate the trial at a later date. That may be the issue here where malwarebytes installed things you opted out of without your permission that conflict with bitdefender. You might have some luck contacting malwarebytes to see if they will give you a link to an on demand only installer so you can still use it along with bitdefender. It's worth a try if you like malwarebytes as I do.

 

False alert! The problem came back a few days after.
I don't know what to do (having tried the solutions proposed in the other thread).

@kenbok51 Thank for the information. The version I had was the free version. However, now, it's seems that it was not the source of the problem!

 

you can disable premium settings in malwarebytes. including online protection in the trial version.Im pretty sure i opted out of the premium version through the settings after i downloaded it and it went back to the free manual scanner version.

 

Make sure "com+event" is started in administrative tools/services and set to automatic as it is a dependency for system event notification service.

 

The latest Windows Update seams to have fixed the problem on my PC:
2018-03 Security Update for Windows 7 for x64-based Systems (KB4100480)

 

Thanks for the info hellwoodice, I'm going to see if my pc has that KB4100480 update and get it if it doesn't. This problem is driving me nuts, nothing I've tried has solved it.

 

No luck, pc already had that update.