Click on File -> Options -> Messages and deactivate all popup windows that you don't want to see anymore.
(I'm not sure what you mean with "modifying file information":
If you try to rename or move files that already exists in the target folder, you have to choose another format string to get another target filename. You can not have the same filename twice in the same folder.)
If you still get such a popup window, please show us a screenshot to see what the reason could be.