i fixed avast in control panel/uninstal/change/repair and reset computer now everything is working
restart PC not reset my bad…sorry 
anyway now its working i fixed it two times like that first when win 10 update spring rool out and yesterday afther avast update…
There is no need to shout (ALL CAPS) or switch off the CAPS LOCK key.
I have ran into this as a fix on several places, including the Avast Support Link. My main issue is that some of us have Remote Desktop DISABLED for security purposes… its a real thing, Google it. Why does Avast force us to use this feature that has long been known to be a security threat and even recommended by security professionals to have disabled for a truly secure environment?!? I truly don’t understand how Remote Desktop would affect the UI unless it is a remote connection.
Enough about that as it becomes clearer with every Avast update that it has been trading off what it once was for analytics’ gathering and ‘security-by-the-masses’ instead of the groundbreaking technology it used to represent. Enough about that as well.
I have noticed several things going on when I end up with ‘UI Fails To Load’…
[ol]- It is not always dependant upon a full start from being shut down or being recovered from sleep mode. I have two machines that jump between both circumstances.
- It is not always noted that the UI fails to load and I discovered this by hovering over the Avast icon after waking from sleep mode or starting up. It takes a mintue or so to realize I am over it then it turns from the regular icon when everything is okay to one with a red x on it and when I try to open itthats when I get the message.
- At times, I become aware of the situation in the above listed observed happening by my Windows Defender icon will suddenly go from a green check mark to a yellow exclamation and again the Avast icon will sometimes go to the red check mark and then other times it wont; upon the times it wont go to the red check mark I try to openn the interface by clicking on the icon in the taskbar and get nothing. I can only get the UI to try and opne by going into Windows Defender, selecting the Firewall option and then clicking on ‘Open Avast Antivirus’ from there.
- One last thing I have observed is my firewall is not always starting up in Avast and when that is the issue and I go turn it on, as soon as I recover from sleep mode or restart I end up back at the UI Fails To Load issue[/ol]
Now I am no Avast developer but I think someone has found a way to disable Avast or the new update has a giant security issue. I like the new interface, when I can get it to load. I am concerned that my security product seems to require I have remote desktop enabled and running from years of knowing the risks that can generate. Avast DOES need to come up with a fix or start looking to see if maybe there is more than just a bug going on here. I will go submit the files but I don’t have much faith in the process from reading all the complaints and this issue still so prevalent.
I hope that Avast gets it back together as at this pae Windows Defender results are starting to make it appealing to not worry about 3rd party protection. At this point, if I could buy just the Avast Firewall I would.
On another note: I have been faithfully using Avast since before htey even had a FW in 2.0. We need to start taking better stock of people reporting on these forums issues with this product. Yet I expect this forum has been taken over, for the most part, by those wanting to silence others from reporting genuine issues…now what could be their reason for that? If I were a cyber-criminal orginazation, its what I would do. >rant over<
The main reason I don’t have much faith is if it is an exploit, don’t you think the makers might have thought we might use the tool and come up with a method to not let it submit accurate data?
Anyways, here is proof I submitted the info.
Hi to all,
As every body, I have also the same problem: running win 10 v1803, error 1067 when I try to start, manually, the AV windows service. It’s that several call Avast UI fails…
The Avast firewall service is running well without any problem. The real question is: are e protected when we surf on Internet?
Now is the Avast dev team is aware of the problem I ask why this avast engine release has been deployed… The last one was running well inside win 10-1803.
Wait and see but how long for?
Francis
Hello, today we expect to release uudate for this issue. If you reboot your computer, does the issue still persist?
Hi to all,
It seems that this soluce runs well.
Some specialized web site explain that some windows services are not usefull inside a local computer desktop. And it may happen that some windows services are to be switched in a manual mode or worst in a disable mode.
After have a look on the Windows services of my computer, I’ve seen that the remote desktop service was disabled. A quick modification of this state to automatic was the graal of the perfect running of AV Avast after the reboot of the system.
So now this issue sis solved for me.
My wait is over,
Francis
Still no compatibility of AIS with W10 1803 ( release 17666) 
Hope this will be solved b4 I have to renew ( or not) my subscription.
to have the remote desktop service permanently activated is not a soulotion but rather a workaround. as you can read it from several sources the permanent activation of remote desktop service is not really recommended.
In my opinion that is why avast should also work properly if this service is disabled.
I really hope that the problem will be fixed like hectic-mmv announced it.
Hello, today we expect to release uudate for this issue. If you reboot your computer, does the issue still persist?
[/quote]
Please keep us posted when update is incremented
Just did the windows update today and ran in to the same problem everyone else has.
UI Failed to load.
This is really embarrassing.
AV Service is not responding.
I hit restart but it still fails. So far avast is the only program or setting I’m having a problem with.
Keep us updated asap.
Certainly not everyone. Which version of Avast ??? Free or paid ???
Free version 18.4.2338 (Build 18.4.3895.0)
I updated Avast earlier this morning.
Then now I’ve just upgraded Win10 to the latest version and I’m getting this UI Fails to load message.
So what do I do?
P.S.
I can reach the update page by right clicking on the icon. I noticed it says no connection established.
Repair Avast:
Control Panel> Program and Features (Add/remove program)>Select Avast> Select Repair. Reboot when completed
https://www.avast.com/faq.php?article=AVKB204
If Repair doesn’t fix the problem, try the following:
Clean Install of Avast:
https://goo.gl/4Ptzkf
If you need additional help with the Clean Install, watch this:
https://youtu.be/p-h3myRD51A
Thanks mate, got it all working now.
I ended up having to do a clean install.
Running AIS paid version. I hadnt thought to use the uninstall/clean tool. I will try that later tonight when I get home. I have tried repair as well as regular uninstall to no avail.
On a side note; I have noticed if I restart with my internet (wifi) disabled then it loads up fine yet after I re-enable my WiFi I pull up Avast. It tells me everything is good to go but I checked and discovered the Firewall was now turned off. I turned it on and then I was back to ‘UI Fails To Load’ issue. This has to be a bug and perhaps the bug is only in updating but then persists in some form of saved information when just doing a regular uninstall/re-install after the update fails. Again Ill try the cleaning tool later.
What did you use prior to Avast ??? How was it removed ???
Based on the above feedback, keep in mind that the problem may return in a day or two. :-[
The update W10 1803 seems to have made the problem deeper with avast, besides the staf says still working on it.
On the other hand
Right , as far I’m concerned , a week I have 1803 updated (AIS paid vs anymore) , and I never had the problem, even on the first reboot, there’s certainly another element that bothers them .
When?
How is the update implemented?
Also… it better fix this issue permanently. :-\