My family has been using Kaspersky for years and there were no problems. But after updating our family's subscription yesterday Kaspersky Plus is no longer launching on my PC.

I gives me an error message about "Microsoft .net failed to initialize" which started today. Never had this issue before. There were some "The prior start of the program failed, do you want to send a report." message and i did send reports but nothing ever came from this. Today Kaspersky Plus does no longer launch at all. It keeps crashing during the launch process.
I know there is a multitude of different posts about this issue over the years but NONE of the solutions there did jackshit for me.
I'm on Windows 11 Version 25H2. My computer is the only Windows 11 one and the only one with this issue.

I tried the repair tool for Microsoft .net which didn't help.
I tried reinstalling Microsoft .net which didn't help.
I tried installing other versions  which didn't help.
Nothing does anything. And the ONLY programm with this issue is Kaspersky...

@PH97 Welcome on the K Forum.

Did you read this Kaspersky FAQ  https://support.kaspersky.com/de/common/error/installation/11682#block2 ?

vor 45 Minuten schrieb Berny:

@PH97 Welcome on the K Forum.

Did you read this Kaspersky FAQ  https://support.kaspersky.com/de/common/error/installation/11682#block2 ?

Yep i did. Error persisted. I got it from a prior post about this topic --> https://forum.kaspersky.com/topic/failed-to-initialize-microsoft-net-framework-31476/
none of the solutions there worked for me.
Over the course of my actions i also installed a couple Microsoft .net and runtimes.
Here is the list.

Weirdly enough though. Right now Kaspersky works. Or rather the autostart does NOT work. Starting it regularly does also NOT work. Launching it as administrator (which believe me I tried before) does however work...

I have no idea if i should just take this "win" or keep on medelling and hoping that i can fix it. I'm also kinda afraid to restart my PC and see if it still is launchable via adminstrator after the restart :S

Edited November 24, 2025Nov 24 by PH97

@PH97 

You could try to reinstall Kaspersky on-top as ADMIN , but a better option is to contact Kaspersky Technical Support :

→ https://support.kaspersky.com/b2c#contacts

The product doesn't use a system framework. It uses the one that's installed with it (C:\ProgramData\Kaspersky Lab\AVP21.23\dotnet).

Therefore, it doesn't matter which versions of .NET are installed on your system.
Try reinstalling Kaspersky.

vor einer Stunde schrieb andrew75:

The product doesn't use a system framework. It uses the one that's installed with it (C:\ProgramData\Kaspersky Lab\AVP21.23\dotnet).

Therefore, it doesn't matter which versions of .NET are installed on your system.
Try reinstalling Kaspersky.

Trying to reinstall Kaspersky Plus now. I keep getting an Error message though:

 

@PH97

10 minutes ago, PH97 said:

I keep getting an Error message 

For privacy reasons we don't request system Logs , please contact Kapsersky Technical Support.

You're experiencing some problems with the system.
You need to contact Technical Support.

I'm on it with the tech support.
I hope they can fix it. If there is some kind of "universal solution which i had to do" i'm gonna post it here again in case somebody else experiences the same problems as i did. Since as aforementioned other people had a similiar issue before.

Update: Since the problem couldn't be solved at first, I was referred to the product development in Moscow.

They were able to help me reinstall Kaspersky Plus.
The problem was the setting “Intel Turbo Boost” (Intel Turbo Boost Max Technology 3.0 / Intel Turbo Boost V3) in the BIOS.
After I disabled it, I was able to install Kaspersky Plus without any problems.

I don't know whether the original problem (the product doesn't start due to an error message “Microsoft .net failed to initialize”) has now been solved or not. However, I will ONLY get in touch again IF the problem occurs again.