Visit https://cat.eduroam.org/?idp=5092 and download the installation program for Windows. Philipps-Universität Marburg should already be displayed as your home institution. Select the correct user group (Students, Staff).
Execute the dowloaded file.
Follow the instructions. Activate the configuration of the access for wired connections (exception: F&L-U network in hospital buildings). Please do enter the username in the long form, i.e. as muellerx@staff.uni-marburg.de or Muellerx@students.uni-marburg.de Please note: Despite the similarity, the eduroam username is not an e-mail address. Aliases of the form givenname.surname@staff.uni-marburg.de will not work!
Restart your PC and test whether the connection is re-established.
Wired eduroam only: Windows 10 has a bug that prevents saving the wired eduroam password from above setup tool. Instead, you are prompted again on first logon. When a grey Window named Windows Security pops up, please enter the long version of your username again, along with your password.