Dear all,
Yesterday I made the upgrade from opensuse Leap 42.1 to 42.2. I had installed kde plasma 5, and besides it, I installed gnome, mate and xfce desktops. Now, I cannot start the windows system (desktop). Any ideas how to fix this? please!

And what exactly do you mean with "I cannot start the windows system (desktop)"?

Do you get an error message when trying to login to a Plasma5 session?
Does it not appear as option on the login screen?
Do the other desktops work?