Windows 10: Yandex files on pc

Hi. I have a question. Why do I have Yandex files on my disk? I checked the disk and accidentally discovered this. And the installation dates of these files are different. But I did not install Yandex. What is this and how can I solve this? Since today I found an application that was downloaded the day before yesterday, how is not clear. Can you explain and help, thank you

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Yandex maps problem

Hi all, I'm using Yandex Maps in my Nokia X6 instead of Nokia Maps because it includes the traffic info here in Turkey. But when I try to make any text entry, Yandex maps hangs and disappears. I can only end it using task manager. By text entry, I mean
any kind of entry such as renaming favorite locations of signing in. My wife has Nokia C6-01 and she can make text entry without any problem. I checked MIDP versions of both machines which are identical. Any suggestions?

 

yandex

yandex has taken over home button. can't get rid of it, is there a fix or do I suffer the Red ring of death?

 

Complete removal of the Yandex virus

I use Windows 10 and Microsoft Edge as my browser. Somehow my I picked up a variation of the Yandex virus, an adware virus. I followed the removal suggestions that I found on on a Malware site that included ADW Cleaner, Malwarebytes, Hitman, and Zemana cleaners.
They seemed to work in that they stopped the incessant ads. However, I still don't have access to Microsoft Edge and am also denied access to other items. It only allows me to use Google Chrome.

If I try and go to Settings to change my default browser, I get a box that says "This app can't open. Contact your administrator..."

Also, I cannot use Start and I no longer have any sound at all.

Any suggestions as to my next step?