I installed Dropbox on a new PC. Later I decided to delete a folder from within "Dropbox". First it says I need Administrator permission - OK I give that. Then it gives a "Folder Access Denied" message with "You need permission from <$PCname>\<$Username> to make changes to this folder". I can't see any way to proceed as the only options are "Try Again" which repeats the same message, and "Cancel".