I upgraded from WIn 8, where everything was ok. Now the Win 8.1 "maintenance center" keeps telling me "Solve a problem with virtual machine" (translated from German), which guides to the re-installation of Parallels Tools. But it progresses quickly to 15% and then is stuck. I can only cancel the re-installation with the task manager. It's always the same, regardless how often I try.
What can I do?
What can I do?