What on earth, i just had distant access from someone to my system right before my eyes... My laptop got suddenly brighter, menus and buttons changed structure all at once, mouse started moving on its own, it even closed a window tab all by itself... I might know who is, why etc. But i must end this.

Tell me some good software to detect and remove any threat like back door, unauthorized distant access to your system, etc... And a question... Are there actually laptops (or hardware) specially designed for this functionality, as a built in feature etc? Spyware laptop thing? Because i noticed some peripherals i have, laptop included, say something about "obligatory receiving of interference" and stuff.

A program which shows who else besides me connects to my wifi didn't show up anyone, on the other hand.

Reinstall OS and get a proper virus control.
That knock on the door is the Police.
KNOCK KNOCK..

First and foremost, disconnect your internet asap. Run the system in safe mode and use Malwarebytes Anti-Malware (free), you might want to check for shady software running at startup.

yeah don't even consider turning on the wi-fi. I recommend a complete wipe. Better to be safe then sorry.

keep us posted Op....

leave him with his OS of choice.

Fixed that for you, hehe! :P

Running task manager might give you confirmation, at least in a negative way as to strange ones running.

If you see unfamiliar processes running, you can google them - but be source critical, of course. And there might be quite some clutter in hidden folders, too.

Besides, an independent anti-virus program would be beneficial of course.


Edit: Ps. Do you have Windows 10 as Operating System? You might have unwittingly allowed your home network to be used as peer-network for pushing out Windows updates. See this;

http://www.slate.com/articles/technology/bitwise/2015/08/windows_10_privacy_problems_here_s_how_bad_they_are_and_how_to_plug_them.html

Didn't see anything suspicious in task manager, i even googled out the ones i didn't know. Disconnecting the internet solved that temporarily; after a few seconds it returned to how it had been, before the "takeover"...

Damn me old age, i went through hell for a simple format, i couldn't possibly change OS and stuff like that...

About Malwarebytes, i already had it in and all tests yielded no results, but i never tried it on safe mode or when fully disconnected from the internet.

Can someone possibly please direct me to that specific software against back doors and unauthorized access? I need specific solutions and drastic, urgent measures! Thanks in advance!

I also might be dealing with high end gear or a professional agency behind it. Hence the inability of detection from normal, commercial anti- stuff, i already pumped up my machine with. And lets not forget my former "friends" dearest from real life, had always been rich, highly standing and what's worse, politically connected. In fact, i am pretty much surprised by myself that still am roaming free, i have been buried alive for years with constructed evidence, forgeries and stuff.

Diagnosis
Disconnect internet temporarily. Stay off wi-fi.
Do a virus/system scan.
Check internet/bandwidth monitor to check incoming IP connections. Do a IP trace when you get back to using internet. Any suspicious IP connections will probably become apparent.
Try using a different computer if you have one to change the variable.

Solutions
Increase system security options including browser security for logins and cookies.
Check firewall occasionally for intrusions and/or hacks.
Get better virus software.
Stay away from crowded unknown wi-fi locations.
Don't let other people borrow or use your computer.
If all else fails, stop using affected computer. Do not clone the HD or transfer over any system files or executables. Start using a secondary offline computer for gaming, work, etc. Only use internet with laptop or mobile device, and only at trusted wi-fi places or ISPs.

Make sure you've turned off remote logins. It sounds like you've got RDP enabled and somebody managed to get into the account. https://en.wikipedia.org/wiki/Remote_Desktop_Protocol

It's probably not a bad idea to do an entire reinstall as well, but it's probably not necessary if it turns out that RDP was enabled.

A few things to wonder... Is your computer hooked directly to the internet? Or is it behind a router?

Routers i've noticed are pretty decent, by default they hide all ports that aren't actively in use, or specifically programmed to be open for services or port forwarding...

The second is i'd recommend a good firewall. In the past i'd recommend ZoneAlarm, which by default lets NOTHING access the internet, and you have to specify what is allowed locally or via the internet. More than once it helped me identify programs that shouldn't have been there since they needed permission from ZoneAlarm, and outright failed unless i gave it the okay.

A note, since they did version... oh... v1.93?, they started adding a bunch of crap to it that told you your system was insecure and basically ad-spammed you. It was suppose to be later removed due to huge backlash by the community, but i haven't trusted them since. That was back probably when i used 95/98 so i don't know the state of the firewall now.

Except that there is malware which overwrites Bios/ Hdd firmware etc. To get rid of those, good luck ;).
Anyway back to topic, most common malware today is pretty stupid so a clean reinstall of the OS would eradicate it. But as others pointed out, first check that tou don't have remote desktop active.

After doing a clean install of windows, usually i have it totally unable to access the internet, and then i disable everything i don't want running... Time? Who needs that. Print Spooler? I won't be printing anything from this. Themes? Give me the bare minimum baby! MS Update! Disabled for life!

Once everything is running and everything is disabled (along with any protection software you think you need) only then i'd consider putting it back online... But if you're going to do a clean install, you might also do a full backup after the system's ready to go up, just in case... I've never had to restore from a backup, but a full raw restore will probably be faster than actually going through the process. Probably use http://clonezilla.org/ , but i'd say after you choose a version, don't change the version, use the same one if you have to do a restore (Just in case some changes don't make the backup useless for some reason...).