have just installed the platform update version 19.1. the problems i have encountered since are, Libre office will not launch because it informs me i am running windows xp operating system, so it will not launch. also Sumatra PDF portable willnot launch it gives me the same message. Other applications such as Open Office. Audacity, are not affected. Also the app platform does not stay active on the task bar, after an application is started. So everytime i want to look for new apps or start another programme, i have to click on the start button again, and ask me if i want to make changes to the computer. can i go back to my previous launcher. or can you fix this problem. I am running windows 7 service pack 1. on a 64bit system. never had any such problems previously. thanks Ron.