Brilliant! Worked first time. Easy to follow, clear instructions. Thanks so much!
Thank you, Kevin! You just gained another fan!
This works. The only solution that fixed the problem after trying too many others after spending 2 days effort. Thanks. Greatly appreciate the help!!
This will do, works on both 64 and 32 bits. Just follow the instructions.
- Now, click over the GPSvcGroup from the left and create 2 new DWORD For this purpose, right click on the empty space on the right and select New > DWORD (32-bit).
Good day!
My laptop is 64 bit, how should I change the New - DWORD (32bit)?, would this still do or I have to do something else? not that savvy. Thanks!
Hi there I’m going through the complete process again to be certain I didn’t make a mistake, the second DWORD (CoInitializeSecurityParam) is the value data of 1 also decimal as the first one only it isn’t stated.
Many thanks
Okay, thanks, I’ll do that
Then the best option is to do a factory reset on Windows 10. I would suggest you submit this as a new question on http://equestions.net/ask so i can assist you there individually.
I have the same issue however I cannot do any commands that need admin permission even if I logged as admin for example cmd.exe, services.msc or regedit, nor advanced options can be launched. Which procedure could I use?
Thanks in advance
wow, thank you so much! I tried 2nd option first as it seemed easier, but it didn’t work.
Then tried 1st option, and it seems to have worked, fingers crossed!
(This problem started for me after an incredibly long Windows 10 update)
Thank you. Very easy instructions to follow. Fixed the issue.
I still have the problem. Would you please help me fix this?
Because there is too much complications in this issue you’ve stated; i’d go for the simplest method is to reinstall Windows.
HEY… I need help… im pretty tech saavy… but this has me stumped… helping a friend… Acer Laptop Win 7 Home Premium… was getting… “The group policy client service failed the logon. Access is Denied” … tried a few procedures…via SAFE MODE… FIRST was to load a restore point… but NONE were available… zip… nada… - so… after a bit of internet research… i foulnd this one… very similar to yours outlined at this youtube site… which more or less added AuthenticationCapabilities (3020Hex), CoinitializeSecurityParam (1) and CoinitializeSercurityAllowLowBox (1) -however I used a capital “I” in CoInitialize 
it didn’t work… then I read further into it… fixed it to lower case “i” …that didn’t resolve… was able to run MBAM in safe mode… found a couple hits but nothing major… and it still didn’t resolve the error… - another video suggested going into the registry … finding the s-1-5-18-xyz.BAK and renaming it… or its duplicate… blah blah… but i didn’t have any duplicates… nor any .baks SO i took it upon myself to create a NEW ADMIN USER…and boot from there… - GONE was the Group policy client service failed the logon …access is denied error message… - HOWEVER… NEW ADMIN USER got… 2 messages… 1) centre of screen… System Restore Completed Successfully blah blah blah …and I HAD NOOOO Idea my friend had attempted a restore… (especially after personally discovering there were no other retore points available) - the 2nd message… in lower right corner above the clock… "Failed to connect to a windows service Windows could not connect to the system notification Service service. This problem prevents standard 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.
You’re Welcome. Your feedback gives me the motivation i need.
You, kind sir, are a lifesaver. My daughter got a new Asus for Christmas. Set it up, let it acquire the updates, and sure enough got this error. Solution #1 above seems to have done the trick so far. Your step-by-step instructions and screen shots were very well done and helpful. Problem solved (permanently, I hope). Thanks VERY MUCH for your expertise and for having taken the time to put this out there.
Windows 10 has more issues then Windows 8. What if it carries the problem over to 10 and brings new issues?
I have a recent Asus laptop running Windows 8. Will the upgrade to Windows 10 fix this problem so I don’t have to go into the registry? (I am a very non-tech).
Please post this as a new question on eQuestions.net/ask - I’ll help you troubleshoot it remotely.
HI Kevin, I am the unique user on my PC and use Windows 10. I have followed both solution options and the error message still occurs “Failed to connect to a Windows service. Windows couldn’t connect to the Groups Policy Client service. This problem prevents standard users from signing in”… Do you have any further advice ?