Ok, I gave up. Switched to Win7 VM, as I had like 3 useful apps anyway.

Thanks for trying to help though!

Tried that, cleaned everything else that ccleaner suggested. No effect...

Not that I know of. There are no antiviruses, no messengers. There is nothing on startup actually.

I use it only for Visual Studio and occasional IE

Not that I know of. There are no antiviruses, no messengers. There is nothing on startup actually.

I use it only for Visual Studio and Internet Explorer.

It may crash in 10 minutes as well. Parallels did remote session and told me that because Windows starts and works before crashing, it's not their issue. I can't say I follow their logic though.
...

same error

sfc completed successfully, but windows dies as before

There is CBS log. I think there are the same few errors. Run it about 5 times already.

Windows still crashes in 20-30 minutes.

I run Win10 under Parallels at MacBook. Few days ago it started to crash about 30 minutes after boot. I don't need to do anything, just wait and it will die. Usually it's REGISTRY_ERROR, but...