Explorer View sort.

I have many folders saved and some saved images and saved Word items, I call individual items. Recently the data changed my brain. All the folders were moved down and the A items are on the bottom and the Z items are on the top. On top of the folders is all my individual items (Word, images, Excel, etc.)

Can anybody help me by telling me how to change it back to the way it was. Something else also happened a few weeks ago in that one of the main folders went inside a different folder. I have never seen any of this. I brought it back to the normal location and it now stays there.

I have Windows 7, Professional. Thanks for the help.