Thanks, i'll try that

And the FSX did start in DX10 after removing those dll's 

Ok thats just what uninstalling  the fixer libraries does. 

Now try installing the libraries again from the controller - if it thinks they are installed - you may have to uninstall with errors first.

After trying to install libraries, it just gives same error than before

That’s ok, consistency is good,

so given it had an error none of those 3 dlls are in fsx and it still runs?

Yes, those dll's aren't in the FSX-folder and FSX runs in DX10-state

Ok good, now do you have the 3.3 installer?  If so uninstall 3.4 from control panel and try 3.3

If you don't have it then PM me an email address and I will send it to you.

Since there are no changes in the library installer I would expect that you would see the same behaviour but lets prove that to be true.

 

Are you running an antivirus and if so which one?

Ok, i'll give 3.3 a try. I have Comodo internet security premium 10 as an antivirus software

Same thing happening on V3.3

https://imgur.com/a/pU7Xf

Again that’s consistent with my understanding - ie that I didn’t change anything in 3.4

can you temporarily disable Comodo and try the library installation then?

If you aren’t happy to do that them can you right click on the syswow64 directory, select properties then security then advanced and let me see the permissions 

 

I turned comodo off as much that i possibly could, fixer controller just gave me same error. Here are my permissions concerning SysWOW64

https://imgur.com/a/suwZi

Ok bear with me, it may take a day or so, for a start I need to translate those into English!

Yes, no problem , i think i can help you littlebit with translation. Thank you for your efforts solving this :)

Finnish on the left, English on the right

Salli=Allow

Järjestelmänvalvoja=Administrator

Käyttäjä=User

Täydet oikeudet=Full access

Muokkaa=Edit

Lue ja Suorita=Read and process

Tämä kansio ja alikansiot=This folder and subfolders

Vain tämä kansio= This folder only

Vain alikansiot ja tiedostot=Only subfolders and files

Luoja-omistaja=Creator-Owner

Kaikki sovelluspaketit=All application packages

Kaikki rajoitetut sovelluspaketit=All restricted application packages

Thanks, that looks ok to me.  Can you tell me what the behaviour settings are in Comodo?