HELP!!! I accidentally installed a Trojan .scr file!!

[Sushie]

A fake SkinFreak bot said
" you have been randomly selected, you are the winer of karambit knife!
In order to get the knife enter the code indicated in the picture
http://skins-bounty. .com/stayfreaky" Dont go to link.
He said that i had 5 minutes before he will choose a new winner instead. So i was desperate. I downloaded it, tested it, configured it, and instlled it, but i didnt see anything happen. How stupid of me, right? I know, but i really need help right now. When i gave up, i tried deleting the file. To my suprise, it said that i couldnt cuz it was RUNNING. Then when i closed my steam client cuz it stopped working, i opened it again. It said that my account was blocked due to suspicious activity. Thenonly way i could get unblocked is by Confirming the 6 trades (that looked like) blank trades on both sides to someone "(some name forgot) System" I confirmed 2 of them, only to realize on the third, when i was about to confirm it, that i was trading my whole inventory. Luckily, i was able to quickly cancel it before my inventory was gone. Af

[Sushie]

After so, i quickly shut down my pc, researched about this .scr file, and found out it was a virus, only to realize how much of a ♥♥♥♥♥♥♥ stupid idiot i am. I havnt booted my pc yet. I need help, i feel unsafe. What should i do? Im only using mobile.

[Tev]

At least do these,

Scan the computer with an antivirus* & antimalware scan in safemode 
First download & install Malwarebytes' Anti-Malware at http://downloads.malwarebytes.org/file/mbam/
After that hold down [Windows] and [R] -keys, type in msconfig
Go under the [Boot] -tab and tick [Safe boot]
Reboot your computer with Safe boot
Perform your antivirus & antimalware scans (with the rootkit scan ticked.)
Repeat Steps 2, 3 and untick [Safe boot]
Restart your computer.
 * = If you can do a bootscan with your antivirus, do it.

If possible, download Malwarebytes on another computer, put it on an external media like a USB stick and put that on your vulnerable computer. Boot the computer up without internet.

[Sushie]

Its 1am here, so ill have to do that tomorrow. But are you very sure that will fix my pc?
Edit: thanks for coming for my aid, good sir.

[Tev]

Well, if you want, you can try TDSSKiller in addition,
http://deletemalware.blogspot.com/2014/11/remove-steam-messages-virus-malicious.html

[Cheeki]

Only sure way is to nuke the pc. Reinstall your OS and you'll be surely safe.

[Sushie]

Originally posted by Galaxyy:

Only sure way is to nuke the pc. Reinstall your OS and you'll be surely safe.

Im young computer user, and I don't know how to reinstall my OS, sir.

[Tev]

Originally posted by Flerikko:

Originally posted by Galaxyy:

Only sure way is to nuke the pc. Reinstall your OS and you'll be surely safe.

Im young computer user, and I don't know how to reinstall my OS, sir.

You'd put the Windows disc in your disc tray (or you'd make a bootable USB),

You'd start up your computer and before Windows loads, you'd hit (generally F11) to get to the Boot Options. (You may also change the boot priority from your BIOS [generally opened up with F2] during boot)

Select the disc drive (or USB) over the disk, and follow the on-screen instructions.

[KoteTrollface]

Firstly, you need to IMMEDIATLY change passwords with your mobile phone (don't turn on computer) on Steam, Microsoft account and services which are you log in after infection (different passwords, at least 10 characters in different registres and with numbers).
There is no need for such a radical way as reinstalling OS. Try to start the computer in Safe Mode and try to restore system to previous date. What version of OS you uses? (Windows XP, Windows 7, Windows 8, Windows 8.1, Windows 10?) Universal solution: Press Win+R, type rstrui.exe to open System Restore and select something date before infecting computer. Restore points will automatically be created on your computer if the automatic update of system was enabled. You will lose all files and programs that was recorded on computer after this date, but most likely delete the virus.

[Sushie]

Originally posted by KoteTrollface:

What version of OS you uses? (Windows XP, Windows 7, Windows 8, Windows 8.1, Windows 10?)

Windows 10, good sir.

[Sushie]

Originally posted by KoteTrollface:

Press Win+R, type rstrui.exe to open System Restore and select something date before infecting computer. Restore points will automatically be created on your computer if the automatic update of system was enabled. You will lose all files and programs that was recorded on computer after this date, but most likely delete the virus.

Ok, sir. In done doing that. I restored my pc before the 14/10/2016 system update in safe mode, as you've said. However, im still scared to run my pc normally. I need your assurance that im safe. Thanks again, good sir.