Ok, interesting. This mean SF not even installed yet. So can not be the cause of the problem. Now what ?
Btw. Did full delete, register cleanup, hd clean up, reboot, re install, same problem :-(
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Just tested the mission editor. The editor does not start. No errors or freezes. It simply does not start and after a shortwhile of seeing the sandglass the mousepoint changes back to an arrow and the OS moves on. Although there is a process "SH3MissionEditor" loaded in the taskmanager nothing happens and I can continue doing whatever I want to do.