Arduino doesn't start and create processes endlessly in task manager

After fumbling around on this forum for more than a week with this same issue, I found this thread and it also fixed my same issue. After several years of using the IDE, all at once I had this issue. All created by that foolish OneDrive. I also had the issue of "no Location tab" in the "folder properties window". I had done everything I could find on these forums to kill Onedrive but nothing worked. However, when I followed your advice here and corrected the registry issue regarding the "User shell folders" the issue is resolved.
I sure hope this will help others with the same issue. It is very disgusting when you have been a long time user to discover that you are back at "square one".

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