Hello everyone
After Windows update my Avast browser stopped working, can’t open it, can’t uninstall, Downloaded it again and tried to open it and it’s not working. Little window pops up that say " Application has failed to start because it’s side-by-side configuration is incorrect. Please see the application event log or use command - line sxstrace.exe tool for more details". Anyone had this problem? How to fix it?
Hi,
could you please share which Windows build number you had before and the one you have now after the update of MS Windows?
Thank you
Hi Sandu
I have 18 mth old Dell laptop Inspiron 16 7620 2in1 that has Windows 11 installed.
Windows updated this and can’t open Avast browser and sound is scratchy.
Release Date:
11/02/2025
Version:
Before that version on the 29.01.2025 this was the update
Release Date:
29/01/2025
Version:
OS Builds 22621.4830 and 22631.4830
If I try to open Avast this window pops up. I don’t like Edge browser so I downloaded Google Chrome and it works, but I like my Avast. Any help will be much appreciated
Regards
Barbara Bogdanska
Hi,
please try the following steps:
There is a way/tool to remove it completely:
Uninstall Avast Secure Browser - Secure Browser Removal tool, https://download.avastbrowser.com/avast_secure_browser_uninstall.exe
Then download the following installer and run it:
https://download.securebrowser.com/ab/avast_secure_browser_setup.exe
I hope this helps.
Hi Sandu,
Your suggestion worked 
Thank you
Regards
Barbara
About one week ago, I had trouble with Premium Security disappearing from the Systray. I fixed it using Settings->Apps & Features-> Repair. It worked after a Restart, but Secure Browser would not open. I likewise did a Repair and it worked until today. Using Open File Location twice on the Secure Browser shortcuts, I saw two folders and two .exe files, AvastBrowser and New_AvastBrowser. I double clicked New_AvastBrowser, and it worked! Following the shortcuts once again, the old version had disappeared and New_AvastBrowser had become AvastBrowser.