Skype has been terrible lately, lots of vulnerabilities security wise, their forced ad service being even worse. It is free but I would suggest getting rid of it and moving to something like raidcall. I've had 3 PCs get infected with random adware while they had skype, one I completely reformatted and reinstalled windows and after reinstalling skype had the same infection occur within 2 days, about 3 weeks without skype on all PCs and no issues, I've narrowed it down to skype and got rid of it, I would personally suggest anyone using skype do the same although others might have different opinions about it.