If you only moved files outside LR at the folder level say from the original folder to a new folder then it will be easier to fix. If you moved files from "multiple folders" into one (1) new folder then this is where it starts to get messy and time consuming. Fortunately once you relocate the files to their "original" folder locations (i.e. folders with '?') all your edits will be reassociated. Unfortunately this will also "undo" all of your folder "reorganization done outside LR.
The freeze at 70% could have been caused by any number of things. I'll respond back in a minute with some other suggestions...hold on.