I did it, i did it!!!
I did a looot of searching and found these two sites: answers.microsoft.com/nb-no/protect/forum/mse-protect_scanning/politiet-institutt-for-cybercrime/afb69773-2e93-4fea-b654-112eb17a8852 and americanpendulum.com/2012/12/03/norsk-politi-institutt-for-cybercrime-virus/ (sorry i cant post links )
I followed the instructions and now my computer is unlocked and clean (i had to download an antivirus program after unlocking it, so i followed ArtificialGlory's advise and chose Mawlarebytes. )
Oh, the most important thing: I had to go to Safe Mode and use the System Restore. 🙂