Windows 10: System error 5 | No admin rights | Lost admin password | can't reset

I ran Roguekiller and tried deleting some of the things it suggested as harmful but it failed doing so.

 

Do you know what threats were identified? Were you able to grab a log or screenshot? Can you run it again, and grab a screenshot at least, so I can see what we are dealing with? It makes a difference.

 

I tried everything you said, but the scannow isn't allowed, the Rkill and RogueKiller didn't help, I didn't manage to delete anything.

 

You apparently have a malicious process running from your AppData location:

There is a proxy server detected on the system.
Your Windows Firewall is disabled.
There are several Windows services that are not running, which should be.
Other issues are evident from the RKILL log.
It's really a mess, to be quite honest, and without being able to boot from the Kaspersky Rescue Environment, (or any other rescue environment for that matter), there is no way to accomplish anything from a limited user account.

I'm afraid the recommendation from me would be a complete reinstall, completely wiping the hard drive first. Since we can't identify exactly what infection(s) you have, it is important to wipe, as some infections will survive a "reset", and even a clean install without a wipe. (FWIW, some infections will create a hidden partition, so as to surface after a clean install, therefore it is important to remove all partitions and wipe the entire hard drive, to be sure it is gone.)

Windows 10 - Clean Install - Windows 10 Forums

I would use the ISO from MS TechBench to do it.
Tech Bench

The system will activate automatically, because you have already had an activated W10 installation on the computer.

I know you were trying to avoid this, but I just don't see any other possibility; I'm sorry. If it were my system, I would absolutely want a clean install on a completely wiped drive, to be sure that everything is gone, never to return. I also would be very careful of what I install on the system. *Wink If you need instructions for a complete partition removal/wipe, please let me know and I will get something for you.