Eureka, I found the problem with not being able to open itunes after last update. This evening received a prompting for an apple update for Quick time player. At first almost deleted it in my digust with apple since last update, but figured hey, could mess things up any worse, and so clicked yes. Apparently problem was with quick time which was also updated with last itunes update, as after that my itunes opened up. Appears to be lots of changes, but hey, can always learn them now that it is working.