Can't type appname after winkey or search window.

I checked the system with Farbar recovery tool, and even there that account wasn't anywhere. One strange policy regarding windows updates, but fixing it (surprise) didn't affect that.. I noticed more weird thing this time. When I left the lock screen to idle, while texting with my gf, suddenly the chosen account was mine, and there was no that temp account at all. It apparently is visible for a while, and after screen going "blue", and I move mouse, it disappears. Very strange, I have never seen such thing. I think I will reinstall the whole windows tomorrow, it wont affect using the pc, but it is an annoyance. :/

Thank you for all your help and thoughts. If some mystery solver comes and knows about this, it would be nice to know what the...

I chose to not keep any data.. But it does not matter now. Let's see what happens...

Dalcina, what of your replies I did not answer? The registry thing with profilelist etc. has been answered.. nothing there. And I answered after your last link of ways to remove account, that none found that strange account. I don't see any post that has not been answered. I may have skipped the "tutorial into first pc", like clean install tutorial.. I have installed windows thousands of time, in all the different and strangest ways since win 3.1. So I don't need such tutorials or backup help, I have system restore always on, it helps nothing in this case. Also backup of the system has the same problem. I need help with an account that appears at login, but does not exist in any app, inbuilt or downloaded.

Every other post I have done and answered. Even after that, the answers are merged to my other posts automatically, because I replied so soon after the other answer.

Anyway, new info is, that the mystery account is on safemode login too, (surprise). But strange thing is, that the original issue with search bar closing when trying to type, is "happening" in safe mode. Even after I made refresh windows and keep files, totally new account etc. But after I boot into normal mode it works again. Not for long I guess. I think I just clean the drive and install from a totally clean slate. This is too weird. I have checked Autoruns (just to be sure) and nothing there. I have checked Farbar recovery logs, including shortcuts log, read the list of all those files and folders, and they seem right, and familiar (It's funny how millions of files become familiar after dealing with them always, apparently too much, heh). And after all this, this haunts me. But maybe it is time to admit there is an account which can't be seen from windows or safemode or bootable winPE usb. And the winkey breaks again soon, as it does that already in safe mode. At least that closes possible affect of any app or such.

And to the earlier, yes, I have removed AV totally because it is a "clean install with keep my files" .. and defender for that time too. I gave that AFP a new chance with my new account, with no av or such. It failed again on account creation, and left me with some temp account only and now there are two folders in the users folders, which has my personal data in them, but they no longer appear as an account. This is not normal, that same error appears again so soon, etc. Maybe I just clean the drive and go fresh, I have my stuff and copies of important parts in many places, so it is only about time, not losing anything. This just was so strange, I wanted to see how it is possible to be that way...