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#21
Take it from one who had done a repair install. It's not a nightmare, just boring and time consuming - more like watching paint dry.
The end result is a system that still has all your installed apps and documents, you'd be hard pressed to spot any difference. Virtually all settings are retained, the few that may change are things like Fast Start-up being turned back on (if you had turned it off before).
The only significant change (apart from things being fixed) would be about 20GB of space used by the windows.old folder, which would be deleted after 10 days anyway.