Ok, so I think I got rid of it.
It took sooooo long
I had to do a lot of reading. I found some very useful articles(including the one you gave me, thanks for it, it was really helpful) like those two http://www.xp-vista.com/spyware-removal ... oval-guide http://www.bleepingcomputer.com/virus-r ... ransomware
I started my PC in Safe Mode and I downloaded these two programs http://www.malwarebytes.org
I think they did a fine job, at least I can use my computer again
thanks again for helping!