I am having this exact problem that was posted in 2012. Is there any fix out there?
"Our WMS 2011 Premium server boots and then after the association of the mouse and keyboard the screen saver starts and then simply moves when the mouse moves or the keyboard is touched.
There is no way to get around the screen saver and the system is not accessible from any other station.
We can start the system in safe mode and log in, but not apply changes or update the system."