Check this out http://soft2secure.com/knowledgebase/arena-ransomware If you have any freeware bundled with ransomware for whatever reason it is, this is not just a thing to to consider. I would not mess with any guys who tolerate those deadly viruses saying, well, we cannot survice on donations, so we opt for dropping a bit of scamware.
'The problem is garbage like Open Candy and IronSource. These things cause incalculable wastes of time and problems, especially for novice users. I can not and will not ever recommend a program/app which is associated with distribution of browser search bars, adware, ransomware' ehmmm, ransomware is not a problem, it's a disaster, IMHO