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Same machine, still Windows 7. The launcher for EU4 doesn't work either, but at least when I add -forcedlc to the target for its shortcut, the DLCs actually work. (As far as I can tell because Purple Phoenix missions fire)
Right so you still have a machine/Windows problem, probably .NET. And I'm beginning to suspect that -forcedlc doesn't work on CK2 any more. Did you take your machine somewhere to get looked at, as I suggested? I'm not really qualified to fix .NET issues such as you have.